HAHAHAHAHAHA, yes they would. You only had to show him Uncharted 3, Last of Us, God of War and Killzone. If anything, the difference in power is even bigger this time, 50 percent better GPU and faster ram. I believe we've already seen the difference, compare the Dark Sorcerer, The Order or Deep Down demos to the Xbone games. No contest
I have both consoles and am completely neutral.
From my point of view the PS3 exclusives look only distinctly better if you play on a smaller TV. The larger the screen gets, the more visible the jaggies are, which is really off-putting.
I have a 55 inch Flat and have to say that most of the games look better on the Xbox360 due to the better antialising (multiplats). If I compare both with my PC, which is connected to the TV as well, they both pale in comparison.
The new generation won´t be any different. Maybe there will be 3-4 games, which will look a little better on the PS4, but it´s not as if it is capable of rendering in 4k, while the Xbox1 isn´t. In some years, while console players are arguing about minimal technical differences, it will be PCs which are making the true next step again.
So just enjoy the games and buy the console, which better suits your taste and needs.