At this point I am more impressed with the PS4 and that's mostly because they have centered their attention on the gamers and the developers. It's such a great thing to hear, how developers are praising the system cause if things are good for them in terms of creating something that provides a lot of potential in their development with the added ease of being able to create something; in the end, that means better games for us. It's like Sony took everything that was wrong about the PS3, changed it, and made improvements. I don't see that from Microsoft...well, at least not yet...the final stroke will be at E3.
And, honestly, I'm still very much enjoying my PS3. There are still a bunch of games I have yet to play or want to play i.e. Last of Us, so I have no desire at this point to shell out another $400 or so for another system. That may change of course with the info at E3, but I've yet to really see anything that says, "OMG! I must buy this system now!" That's not to say I don't believe that Sony won't continue to deliver some awesome exclusive titles...I mean, the day Uncharted 4 releases, lol, I'll be in line with a PS4 in hand.