Yes, there's that, too, the whole higher-end thing...... I have (oops, had) a Nikon D3 and was comfortable with using that, but things have changed quite a bit since the time that camera was released. This new Sony A7R IV is really rather intimidating on the surface, but I keep reminding myself that there will be features and functions that I won't be using, and that's fine, just use what I need and want and the rest of it is there when I'm ready......
Choosing the best camera and lens system for one's budget and photographic needs and desires is absolutely of prime importance. That is one reason it took me so long to arrive at the store making today's purchase, as I have spent the last year or so figuring out exactly what IS important to me, what WILL work out best for my photographic aspirations (what do I really love to shoot? Why? What do I need to do this?) and, well, yeah, there's the budget, too..... I really did have to take into consideration what I would be spending and how each lens I was considering would work best for me and therefore be worth the money spent on it, etc.
I only made up my mind at the last minute about that 135mm f/1.8, as I had been thinking more in terms of an all-purpose 24-105 zoom lens......but for long zooms I already have the Sony RX10 M4 24-600mm, which has done well by me much of the time. Yeah, that's on a small 1-inch sensor, though..... So when thinking about everything seriously I realized that, even though this new lens is pretty expensive and also rather heavy to carry around, it actually would probably be far more useful and satisfying to me than the 24-105mm I'd earlier been considering. Over time I may add another lens or two to expand my repertoire, but for the moment this particular trio is going to be getting a workout from me!