Pancake/Prime Lens Shopping

I posted another thread focused on the aesthetics of certain lenses on my black Pl2.  I'm interested specifically in SMALL SIZE, SHARPNESS, and SPEED.  What I don't care about is focus speed, rapid succession, filter attachments, or video.  I'm thinking of getting one lens now and another in the near future.

20mm f/1.7 vs 14mm f/2.5 Panasonics: Some say that it's good to start of with a 45-50mm perspective, thus the 20.  It's faster and based on what I read, sharper.  And I did enjoy shooting with my old fixed 39mm Canon sd20 in the past. However I think I'd use the wider 14mm perspective more and I also like its small size.  Winner undetermined.  I'm leaning toward getting towards getting one of these two first, except if everyone recommends otherwise.

PZ 14-42mm X Panasonic pancake zoom: Am I right to assume that my 14-42mm Olympus kit lens beats this in overall speed and image quality across the range and that I'd only be buying it for the size?  That said, is it true that the PZ 14-42x performs as well as my kit lens (or the primes?) in the 14-20mm range as suggested by other posters?

Primes vs 14-42mm non-kit or 14-45mm or 14-50 mm Panasonics: I think both Olympus and Panasonic make an improved 14-42mm lens over the one that came with my PL2.  I'm really not interested in buying this because it isn't small, but how does it/they compare at, say, 14, 17, and 20mm to the corresponding primes?  I know the primes are faster, but are they for sure sharper?

17 mm 2.8 Olympus: Am I correct in assuming that the only reason to get this lens would be if I can't afford to get both of the Panasonics?  I do like the silver on the black body, however!

25 mm f/1.4: The only thing I really like about this lens is that it's 1.4 vs the 1.7 of the 20mm.  Does that really make much of a difference in low light?  Sharp, but too long and too big for a prime.

45mm f/1.8 Olympus: This goes against everything I said above as far as size and useful focal length (for me) goes.  However, I like the sharpness of this lens and its speed.  And I think it looks incredibly awesome on my camera and I'd just want to hold it and use it more!  I'd buy it if I found it used, just to have it.

I know these have all been discussed before but I also know discussing things we like never gets old!   Opinions welcomed.  Thanks!

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