PL1 sharper than the PL2 if you look at the resolution test images and compare.
My take is that they upped the default noise reduction to reach 6400, and have more slick, consumerist pictures. A weaker AA filter must be compensated somehow, and DPR made the guess that it was done by better denoising algorithms.
I think that Oly goes through cycles. The first iteration, like the 410 in comparison with the 420, is sharper, the second is less sharp but might have better DR and higher ISO.
I regretted selling the 410, so now I stick with the PL1, and I don't fall for the PL2.
For those who diss Micro lenses, I remind that Micro can mount all kinds of lenses, as good as HG or SHG Zuikos, notably Leica, Zeiss, CVT, Schneiders.
So that resolution can be put to good use with very small rangefinder lenses, which work very well with a magnifying EVF.
The E-5 might have better sharpening algorithms, but the PL1 frees me from dinosaur lenses. In a few months native HG stuff will come, so that resolution can be put to excellent use.
Am.
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Photostream:
http://www.flickr.com/photos/amalric