Upload & Sell: Off
That's the general curse of crop formats - you lose the interesting stuff going on at the edges. You get a more uniform rendering from a good lens but also more flat and boring. Once you get used to a set of lenses on FF it's very difficult to use them on a cropper. My first serious camera was a 7D and I liked it very much.. until I got a 5DII. I simply couldn't go back to the 7D after that - the output looked so flat and boring. The same thing with the M9 & NEX. It's terrible...Show more →
I think this leads to a good point. If you're picky (like most of us on this forum!) I think you have to build a lens lineup for each format, according to your needs, rather than attempting to share lenses with multiple systems. Set goals for what you want with each angle of view, and shop accordingly.
My wide, standard and tele options on my aps-c, 135 and 6x6 systems are, of course, not identical in rendering, but I give it my best shot to choose the most appropriate lens for each system, rather than trying to share any lenses across 3 systems. That's why I can't get rid of the darned Nokton 35/1.4. It has enough field curvature on the NEX that it kinda approximates the look that some of my fast 50s did on the A900 (I emphasize approximates.) It's probably why I keep coming back to the Contax G 35, too, despite it not being technically amazing like the ZM 35s. My ZM 50/1.5 is too new to comment on, but I'm liking its vibe, so far, on the 5N.
Interestingly, comparing the 7D to 135 is a little different than comparing NEX to 135, because the short registration distance of NEX gives us new aberrations to worry about. Maybe some of us may actually prefer the poorer corner performance of the NEX-7, compared to the 5N, because it'll have more vignetting and possible resolution issues, a la 135.