This is not a question that any of us can answer right yet - how much of a leap is the next 'Generation' of video game consoles going to bring in Graphical fidelity.
If we're talking about Wii U, which we've seen already, then we know that for sure the current PC's wipe the damn floor with with that.
Even with the new Consoles, I believe that the most top end PC's will still be more powerful than them, so I believe that answers the question that yes, PC's are a full Generational Leap ahead of Consoles.
I play NOTHING on consoles these days. The only game that I played on console last year was Uncharted 3. I bought Dark Souls and Ace Combat Assault Horizon, but I haven't played either yet. I'm kind of hoping that this Dark Souls petition will pay off and I'll get a PC version - that would be HEAVEN on a stick.
The problem is, that the area of graphics that we are currently moving towards and into is that of diminishing returns.
But, that is no questioning the fact that the Witcher 2 is a prime and clear example of the generational leap. It was developed for the PC and then back ported, so you can clearly see the difference.
Here are a few pictures I've found on the web of the game's 'Uber Mode' at only 1080p, however I play the game like this at 2560x1440, that's DOUBLE the resolution that most of the current console games are putting out and I'm locked at 60fps+. It all comes down to fancy effects like Depth of Field, Anti Aliasing and High Resolution Frame Rates now, as well as huge levels of interaction and destruction that are going to make the difference. Look at BF3 on Consoles compared to PC now.
Here are four shots from
1080p Uber Mode (I think).
Here are some shots from the Xbox 360 Version, to me it's Black and White, but as I said, it's diminishing returns.