The upcoming Xbox One and PS4 are using graphics processors similar to the HD 7790 and HD 7870 (respectively), so its performance is a little more matchable to the gaming experience on the PC. However, the cpus on the new gaming systems are relatively weak (understandable, since you're only going to be using a console for gaming and won't need the compute power for anything else). All in all though, when you look at the somewhat-affordable top of the line GPUs of today's market (GTX 670 seems to be popular at $350), it's still much better quality than those in the upcoming consoles. If you look even higher, at the GTX Titan and the HD 7990 at $1000 each, their quality is much much better.
However, since if you're on a console, you're probably using a TV and only rendering at 1080p (1920x1080), whereas on a PC you might get a triple monitor setup and decide to render at 5760x1080, the gpus in the consoles should be enough. But PCs are still better.