Would be interesting to see a test of a comparable modern lens just so that the reader's could see what has changed on the field over the years. But I don't think there's a lot of non-macro 100mm f/2.8 (-ish) lenses now.
There was of course the Sony STF 100mm f/2.8... but it's not really a fair comparison I guess. That probably leaves the (aforementioned) Sigma 90mm as the only valid point of comparison? Or does the 110mm Apo-Lanthar also count?
P.S. there's a clearer point of reference for the 135mm f/2.8 bunch in the Zeiss Batis but I have doubts it is easy to procure, else you probably would've tested it a long time ago...
There was of course the Sony STF 100mm f/2.8... but it's not really a fair comparison I guess. That probably leaves the (aforementioned) Sigma 90mm as the only valid point of comparison? Or does the 110mm Apo-Lanthar also count?
P.S. there's a clearer point of reference for the 135mm f/2.8 bunch in the Zeiss Batis but I have doubts it is easy to procure, else you probably would've tested it a long time ago...