I've been using mostly my collapsible Summicron on my CL, but I use my 90/4 fairly often too - 80/20 mix I'd say. At that speed, it's easy to focus accurately and, being uncoated, it has a very lovely look with Fuji Reala.
What will be interesting to see is how that mix changes as today I got a Serenar 28/3.5 on "extended trial" (IOW, go ahead, I'm not using it. Pay me when you get the money, no hurry. 🙂 He's a former pro who closed his studio several years ago and does other things these days.) I expect that it will eat more into when I'd have used the two foot zoom with the 50 rather than anything I'd shoot with the 90. Either way, it'll be fun to give it a try!
William