I think you're gonna be happy that you didn't compromise on lens speed. That's the kind of thing that can nag at you later (especially with a Leica). You may get the Summicron urge somewhere down the line, but I doubt it will be for softness wide open. There should be far more than adequate sharpness at f2 for the types of pictures a person will usually shoot at that aperture.
Originally Posted by brian steinberger
Enjoy the lens and don't fret the details.