I had a go with the sony the other day, they also showed me it playing video under water while wirelessly sending sound to a bluetooth speaker. It is rather lovely and they've done a nice job of leaving jellybean alone as it feels very much like the pure version on my nexus 4.
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Screen was lovely but blacks didn't seem amazing and viewing angles were pretty poor.
I'm holding out for the g4 before committing, I do love the amoled screens and after my experience with the worst piece of crap ever (the HTC One X) I'd never ever touch another HTC product!