I used to have the 50/1.2 Limited and found it to be an excellent lens. Somewhere between the 50/1.4 Summilux Pre-Asph and the 50/1.4 ASPH. I wound up selling it as I found that the 50/1.4 ASPH made more sense for me. I don't think the half stop really makes a significant difference, it is more about the look and ergonomics. The 50/1.2 handled well and had a nice look, but it was a bit large and did not look very nice on the camera (I know...a bit petty!), so I wound up preferring the 50/1.4 ASPH. It is sharper wide open, smaller and more fitting to the ergonomics and aesthetics of the M system. That said, if you can get the 50/1.2 for a good price, it will serve you very well. In addition to the 50/1.2, I also had the Hexar, Hexar RF, 35/2 and 90/2.8 Konica lenses -- all were superb and perhaps just a generation behind the latest Leica designs, yet cost a small fraction of the Leica versions...it is very sad indeed that they did not survive as a company! They would have been an excellent compliment to Leica. I particularly liked the fact that they were not conservative like Zeiss...rather than sticking to slower and more traditional camera and lens designs (such as the excellent ZM lenses), they pushed the envelope with the Hexar RF, 60/1.2 and 50/1.2...I wish someone else was still doing this with the same mastery and build quality!