LEICA SUMMILUX-M 50 mm f/1.4 ASPH.

super super super sharp images.
superb 3D rendering.
it takes great portrait.
1.4 is fast enough for most circumstances hense no need to carry the heavy duty noctilux.
size is relatively compact for such a high quality lens.
looks great on any M cameras.

some ppl might find it too sharp but that's what i like about it so i dont see any cons on this lens apart f from the price (28k)....

one of the best 50mm lens in the world. it is quite rare cos there is no stock everywhere. i acquired mine second hand in mint condition. i have to say that once i had this lens attached onto my M8, i dont want to take it off anymore....even though i haave some other high quality lenses.... this 50lex asph is just like the tools made for god. focusing is smooth and easy. i compared this lens with the current version 50 summicron which is also famous for being sharp as well but it cannot be compared to the 50lux at all.

if i am only allowed to have 1 lens, i will no doubt choose this masterpiece.