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.
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!