Triggering my NAS again.
I've been slightly disappointed by the 55/2.8 AIS because it is not good against the light, a situation I often encounter (pipe organs in churches...). Later, the Zeiss 50/2 became my go-around, multipurpose, know-it-all lens, the Milvus version being nearly flawless.
Recently, I started using the 55/2.8 again, with some precautions and less pipe organs involved, and I really appreciate it. It looks like the last 55/3.5 version might be even more attractive. Only issue is, I'm still using the Df with a clear ground glass (I hate split and microprism, finding them distracting, already from my film days) and a magnifying eyepiece, but f/3.5 might really become too dark, as my eyesight is not getting better. Maybe I should give it a try.
Anyway, a great review (as usual). I really appreciate your efforts to show what makes lenses special and interesting!