Sounds like you've made a choice, but... the only things I can throw in here after everything else mentioned I agree with is A ) the obvious - figure out what you need and ignore the rest. The camera I most use is seven years old. Focal lengths outside your uses aren't important and heavy to carry around. Same with aperture. FPS and video too. AF speed? Don't ignore MF. PureRAW and Topaz products can help through AI on ISO performance and occasional resolution needs. These are getting better and I just used DeNoise this morning to battle low light. B ) With sensor resolutions doubling, the longterm lens to body relationship is changing. Most want perceptual resolutions to travel with sensor resolution increases. Character lenses can go on forever, but those aiming for accuracy aren't often built for the next jump. Keep an eye on MTF charts, but there was a repeated line about a ton of older celebrated lenses were really built for 10-12MP. Not the ones you mentioned, but they also were unlikely built for 50-100MP. I have some beautiful Voigtlanders that are my favorites at 24MP, but not at 50MP, unless again you're going for character. Finally, we're all likely different, but I shoot differently with different cameras. Again, I'm being obvious, but struggles often connect with deliberateness. I'm happy camera phones are always getting better, but when I throw the shots in C1 it's obvious I shoot different than with traditional cameras. Same between dissimilar traditional cameras. Finally figure out the more important practical needs around size/weight/speed/other conveniences and it's usually possible to build what you want as most are rarely in a need of more than 1-3 focal lengths, and given resolution-cropping options, maybe less than that.