Considering getting Canon FD adaptor for my E-P1, what lens?

Hi.

I want to try old high quality lenses on my E-p1 and i am wondering if I am better of with a crazy low Aperture. Will I be able to make smother bokehs with a 1.4 than a 1.8? Ok i know that they lower apertures make better bokehs but will they be jsut as sharp, just as good?

Why doesn't everybody go and buy a 1.4 lens instead of a 2.8 or 1.8? the lens i am looking at is a SSC. Does a 1.8 or 2.8 lenses have any advantages?
I am talking about old FD lenses, so all about the same price.
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using camera for fun