Thomas the same could be said for pretty much any halfway decent lens, which includes the above mentioned Nikon.
Mustafa imho the old lenses aren't necessaraly better but they have more presence and a more balanced look than the new übersharp Leica lenses. I love the Summar btw.

The Summitar looks a lot like an early Summicron, so Thomas' advice is a very good one.

Dominik