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Guys, a cross-post from a couple other threads, in case you're not following one of those - I posted my 21mm rangefinder lens shootout review, including some with the GXR: http://www.ronscheffler.com/techtalk/?page_id=130
The four lenses compared were the new Voigtlander 21/1.8, Leica 21/1.4, Zeiss ZM 21/2.8 and Leica 21/3.4 ASPH. On the GXR I think the 21/3.4 is the best performer for edge to edge performance, right from wide open. If you need speed, the Voigtlander is worth considering. While it's a bit soft towards the image edges wide open, it improves considerably by f/4. It's the best all-round solution, in terms of price/performance ratio, if you don't mind the size, which considering the built-in hood, is about the same length as the Voigtlander 35/1.2 II with its hood attached. It's also really nice on the NEX-7, but with a bit of purple fringing, though no more than any of the other lenses in the test.