Confessions of a GAS sufferer!He he he.... OK, as usual... I know nada... ignore this if you wish. Just my personal journey.
Short Version: @Apple fanboy nailed it...
Long version:
I am a camera fashion idiot when it comes to cameras. I am constantly tempted by shiny new things containing the secret to life as we know it - I control it better now but not a week goes by where I am not hovering over the buy button on some website so hopefully I have some experience to help here.
I went from a Canon EOS 100d to a 650d to 70d to 5D mkiii all within the space of three years. Spent a fortune on glass. One every eight to ten months or so because I thought the camera was the issue with my pictures. In parallel I got the Sony RX100 for portability. Then the Sony A7 was released and I got one of those on impulse because I never took my Canon gear more than 200yds from the house because 1. I had a young family and at the time the last thing I needed was ANOTHER bag to carry when we went out and 2. It was new and shiny and garnering oos and ahs.
I then dumped all my Canon gear taking a massive thump financially - EPIC FAIL! should have kept it and sold it smarter - someone made out like a bandit.
I then started my quest for ever more lovely lenses on the A7 as the native selection was pants and low and behold I gravitated eventually to Leica lenses where I think it coincided with me actually learning how to use a camera so it all gelled together - So I thought it was the camera of course.
However, I noticed a tremor in my hands and so when the A7Rii came along with in body stabilisation I took it. I know, I could have got that from any number of cheaper alternatives but I am cursed with liking shiny well advertised cool new things.
So, kitted out with an A7Rii and an upgraded RX100 mk iii at this point, and a lens kit out with native FE lenses and a couple of select Leica gems - not many of the newer FE offerings, I am undecided whether I want to commit to FE mount long term. I have had a few other cameras from most manufacturers in the meantime but compared to the sensor on the A7rii, no contest (for me). So M43, APS-C nah, thanks but I am happy for now...
Then, and this is my point coming sorry... Then I got the joy of an M9 in late 2015 (already 6 years old tech by then). So on paper, technically a downgrade but actually, for me, I found what I was looking for. A body that delivers in the way I want it to and then I have the A7Rii for low light and shooting fast moving 5&7 year olds.
What I have noticed through all of this is that the only really useful improvements through all of this is image stabilisation in body and this so called ISO performance boost is quite frankly on the whole, a disappointment.
The thing is, the Leica has actually taught me better shooting technique and the Sony has taught me that ultimate cutting edge technology is all well and fine but 1. it takes cold sterile images and 2. High ISO is still noisy as hell despite being better. I actually prefer to think of it more as less crappy. When someone says "usable" on ISO level, I ignore them. Usable is subjective and for me, my tolerance is a lot lower than most peoples seems to be. I want a "clean" image up to ISO 12,800 before I consider changing. Not "usable". that term ofr me has words missed off the end making it "usable as a last resort". There are a lot of cameras out there now that do give very good high iso images but they are still grainy.
Also, most people who are competent can shoot at relatively lower ISOs anyway (outside of specialist scenarios of course) and when one stop of extra capability is what you are looking at for putting £1,000+ of your hard earned cash down for (and getting harder every day), I would find a GAS remedy and save the money.
So I would say upgrade like the others say when:
1. When your current body really doesn't do something you need it to do or it breaks.
2. Funds are plentiful and it doesn't cause hardship to have a splurge.
3. When you want to.
To me as I have found my emotionally preferred camera, it is like buying a new PC or Mac. We all have been there right? you buy the latest generation of hardware, you buy the latest sexy model, boot it up and have that simultaneous feeling of "Cool! it is exactly the same" and "Oh! it is exactly the same", because you know it still works the exact same way, it just does it in a subtly better way.
Way waffly sorry... but learn from an idiot with a loose grip on his wallet... buy when you have a compelling reason to, not when you feel pressure to. If your gear is still rocking, dont go knocking on the camera store door...
I have learned that it is better to change less often but be more familiar with your gear's capabilities than to constantly change and never master your tool.
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Are you talking to sports or wildlife photographers and you are a landscape guy? point is it is what you need that matters man 9 years, you know this better than I do sorry.
Are they saying the 80d is slow compared to what? a 1DXMKii..?yeah it is...
I think the bump in performance you will see from a 50d to a 80d or 7dMKii will be sufficient either way to satisfy you as it is a big enough jump in generations.
If you have money to spend my advice would be to spend it on better glass. Changes your pictures much more than a better body.
Also consider second hand. There are some great bargains to be had. Most of my stuff was bought second hand or open boxed.
I couldn't agree more on the ISO comments. What some people describe as usable I'd not want to use. Improved over the previous generation. Yes. Usable to look good, not so much.
I rarely find it's the gear letting me down. Usually the numpty with his finger on the shutter.