I use both and because of it's size, I've started to use the f1.4 only when I really need the speed. The f2 is so much smaller (and ergonomics counts with me) as a package that it always gets the nod when I need sharp. If you're into sharpness, I think my f2 is a smidgin sharper than my f1.4 across the board, and both have a very nice rendering of OOF areas at big apertures, with the f1.4 perhaps being a tad more pleasing to the eye (at least my eye). I understand that Leica is considering a re-issue of the f1.4 to fix the back-focusing issues the current lens has with the M8.