I really enjoyed shooting that wedding. It was 9hrs of shooting, plus nearly 6hrs of travel. But I was paid for it.

I have to say that in operation, in my hand, there wasn't that much between the 5D2 and the 50D. They were about the same size and weight. Facilities wise, they were about the same. The big things were being able to select focus points and setting the exposure and ISO. Which was the same on both cameras.
Obviously once you get the images from each camera onto the computer you'll notice the difference in image quality, but in shooting, I had just as good a hit/keeper rate with each camera. Neither did I have problems with not being able to get focus at a crucial time. But I wasn't shooting in low light (which is when some cameras struggle) and I had good lenses, which helps.
Lens wise, I had use of; 50mm f1.2 L, 24-70mm f2.8 L and the 70-200 f2.8 L IS . A perfect lens combo for a wedding. But pretty heavy, my hand was aching by the end of the day.
Glad people like the shots. It does help massively when you're able to shoot with someone else, particularly when they are able to pose the couple. But all the composition and processing on these is mine.