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Thanks so much for the info. I'm not sure which way I will go yet. Thinking about a 21 or 24 and a 90 Cron also?
I appreciate the advice form both you and Edward.
My thoughts aren't really technical, just kinda real world abrupt gut reviews... It might not reflect your own experience.
I find that modern Leica lenses tend to fit into a few categories, without really getting into to much detail, I'd say that if you like POP and contrast the 21SEM is a GREAT lens for it, the 21/2.8 ZM is a bit less "WOW in your face" and a bit more stylistic with the rendering, so again personal preference, but you can get the ZM for 1/3 the price most days.. The 25ZM I have little experience with, same with the 24elmar, but looking at flickr images for ages (and briefly testing both lenses at different times), I'd say that they both behave quite similar to there 21mm counterparts. The slight exception is that I feel from viewing images from the 24elmar it has a slightly stylistic rendering at close range, and gets a similar look to the 21SEM by far/infinite distances. I know a few people here have ages of shooting experience with the 24mm so maybe they'll chime in.
As for the 90Cron.. I've had all versions of this lens and most of the elmarits too, my honest opinion on the matter is, it's hard to focus, and when you do focus it, there's really little to no payoff.. It's a more flat standard rendering. Let me explain in a bit more detail.. Ok the 75APO is pretty fantastic, the problem is that I think it suffers from massive veiling flare, and what that means is, anywhere where the lighting conditions allow for it, you'll get a washed out image, mind you beautiful bokeh and old school rendering, but no pop-contrast what so ever. BUT in the right lighting conditions, the lens turns into a contrast monster, and you get beautiful soft rendering with the perfect amount of contrast to make your images pop. Now with all versions of the 90cron, I found that even in ideal lighting conditions, the contrast just isn't where I want it to be. So what I'm left with is a sharp lens that renders nice bokeh and has decent (not as good as the 75APO) sharpness to OOF fall off, but it's bigger and harder to focus. Maybe a landscape photographer would have a different opinion. The non-apo versions of this lens, and the fat and skinny 2.8s are only worth it if you're getting a good deal. Otherwise I'd take the decently compact 90 Summarit. It's got a fair amount of contrast/pop, and it's pretty damn sharp. The handling in my opinion is also easier, I find I can focus it a lot easier side by side. Also at this point the 90summarit can be had quite cheap as well, I see used ones all the time relatively cheap!
Hope this makes sense/helps.