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All this reminds me of about 10 years ago when I was in Singapore.
I went into a camera shop and asked what Olympus gear they had. The guy just laughed and said that 'Orympus is crup!". (This was in the daze when Orympus had bought out the OM10, 20, 30, 40......)
He then said "Whut cumera do u huv?" I replied that I had a OM2n... he then said "Oh! You special custumoh. For speshal Orympus customoh, I have speshal lens - loook..." and he pulled out a 50 mm 1.2.... I think he wanted S$500 - about AU$400 at the time.
Really, the difference between a 1.8 and a 1.4 is you reach the skyglow limit in 1 minute or a minute and a half. Maybe the 1.4 will also give slightly smaller star images due to the better glass. But for a 50 mm it is hard to tell the difference - I doubt if you can focus that accuratly to tell the difference.
Having said all that, I have a FD 50 1.4 (the old canon lens) and its great for slow speed hand-held stuff and I still use it with my new 30D, although it acts as a 100 mm f1.8.
A few years ago you could get 50 mm lenses cheap - every 35 mm came with a 50 mm and you could get them for almost nothing - I think I paid $50 for an OM 50 1.4 and $75 for the Canon FD 50 1.4. Now daze the cameras all come with 10 to 120000 mm f560 - 678 zooms or whatever.
If you want a 'standard' lens for a digital EOS, then Sigma makes a 30 mm f1.4 or something like that. A 50 mm will be the equivalent of a 80 mm.
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