I only tested a few of them superficially so far. The Minolta MD W.Rokkor 4/17 disappointed: on the R2 it wasn't really sharp, on the R4 it's really not sharp. The Minolta 2/50, one of the best Minolta 50's for landscape shots, held up pretty well at f/8 but wasn't razor sharp. The Carl Zeiss Distagon C/Y 2.8/28 is still really good on the R4. The Pentax K 3.5/28 (non-M version) is reasonably good but starts to show just a little bit too much field curvature at f/8-11 so there's no reason for me to keep it alongside the Contax 2.8/28. I'd have to do more testing to get to proper assessments but I'm not sure I'll do that; I already have a pretty good idea which lenses will be sold off, even before I got the R4. Some lenses will be tested for sure: Minolta MD Macro 4/100 and 3.5/50, MD's 2/28, 2.8/135, 4/200.Congrats on the new purchase, how are the legacy film lenses holding up against 61mp.