28 cron it had to be said but that maybe a down payment on a car. It truly is my lens cap. Okay forget that it is too much money. I also have found the 35 cron version IV to be SMALL and very good wide open plus has nice character to it like the 28 cron . Now there a little hard to find and me and my big mouth and others as well , Jack also the price has gone up on them. The only real choice for fast in 28 is 2600 dollar used 28 cron or the Ultron and that is big. Zeiss i believe is 2.8. This is the toughest area because you usually base your system off one or the other as your standard go too lens 28 or 35 and normally for spacing with the 28. Than you system should read like 12,21,28,50 and than the 35 mm It would be for spacing 15,24,35 and than 75.
So my advice is get in your head what lens is your gold standard on the camera at all times than build around that.
The issue is people just go buy a lens they think they need . What really we all should be doing is buying a system, so you need to think in terms like that. get your basic lineup in than fill in the gaps.
Coming from the lens pig that is hard to understand but even i did that right from the get go was get the 28 cron and built around it , now every gap is filled but that is a different story