Alexz, to avoid flare, it would be advisable to use an efficient lens shade with any of these 50mm lenses (and with other lenses as well) .
Sure Tom, hood is always aimed on all of my lenses when shooting, still yet there are many situations where lens flare-resistance counts...
): I manage to win a really Mint M6 on Ebay for just under 1k$, took over a month to arrive from US due to Xmas and New Year holidays but was well worth the wait - the most robust yet simple photographic tool I held ever in my hands, in particular coupled to my Summicron 50mm/2 (latest version) - the combo feels lige mest mates to each other...