T
With the Canon, you are somewhat limited to very high quality (but also expensive) Canon EF lenses or the few Zeiss offerings, unless you are willing to pay thousands of dollars to have the front of the camera torn off and replaced with a PL mount, which then limits you to PL mount lenses.
I find the GH1 much more versatile when it comes to high quality glass.
Best,
-Tim
I wouldn't say somewhat limited, you can use affordable Contax Zeiss, Nikon manual lenses, and plenty of other choices on the Canons. It's not as versatile as the GH1 for lenses, but it's no slouch or as limited as you suggest.