Yes, Pokemon X & Y looks excellent, visually. Even so, looking at the photoshop handiwork of Justin -- Bieber, it's hard not to fantasize about an entire Pokemon game in this particular style, with backgrounds like these.
I mean, it's gorgeous! So much detail. Take a look:
Granted, we don't have to leave the sprites to the imagination (or wait until X & Y's release) -- artist Noscium has cooked up a number of awesome Mega Evolution sprites already, along with sprites of the new Pokemon in X & Y. Check em out:
I like to put Pokémon sprites on Pixel backgrounds [Justin -- Bieber]