One X opinion
The camera on the one X isn't the greatest to be honest, the 4S I had prior to it was better and the iPhone 5 I have alongside it is a lot better. In perfect conditions, yes it can produce good results, but often they are quite disappointing.
Music playback on the one X with beats setting can produce really great results, especially if you pair it up with beats headphones, and even if you use other brands the beats works well.
Battery life has improved with the one X but is still its achilles heel. 3-4 hours screen on time max.
Speed comparison between iphone 5 & one X (I cant compare 920 as I don't have one)
Jelly Bean on the One X has produced a very speedy handset and it now benchmarks 6500 on Quadrant which is mightily impressive (beating Note 2 and SGS3) , but i did a side by side comparison, launching apps both on my iphone 5 and HTC one X and while I never had any complaints with its performance, the iPhone 5 did beat it out on every test I threw at it. All apps loaded the small bit faster and the frame-rate even on THD 3 optimised games was still below that of the iPhone 5.
So even though it is clocked faster and has more cores it still can't beat the iPhone 5. How this stacks up with the 920 is ? but seeing as Windows Phone 8 is very optimised I cant help but wonder if despite only having a dual core it will give the one X a run for its money.
Memory management.. Despite having 1GB.
There is a lot of detritus in HTC Sense even with unbranded stock device. From task manager I see that I routinely run close to filling up ram and that is with only weather clock and music widget. (routinely 750-850mb uses) It really treads quite close to the edge of that 1gb ram, that being said I've never actually maxed it out.
I imagine the 920 with 1GB on W8 mobile will be much better at managing memory.
other bits..
I love HTC's car setup. Very handy if you put your phone in a cradle and use it with bluetooth in your car.
But same token Nokia Drive is excellent in its own right too.
If I had a choice again the 920 would tempt me, wireless charging and the camera look excellent, but the windows marketplace and gaming on windows mobile has always left me wanting. I did have a Lumia 800 for three months, but things might have improved in the last 8 months.
I'm keeping my HTC One X for now, but may be persuaded to sell it and buy a 920 myself.