Digital or SLR prints?

Having looked at all the photos I took in Venice with my digital, and comparing them with the ones Patrick took with the SLR, there is definitely something about the SLR ones that is different - especially the B&W ones. I just wish I knew what it was, but the subtle difference escapes me. It's also pleasant to be able to look at actual prints, rather than have to look at them on the computer - I will miss them when I finally see Patrick again, and give them to him - but they are his photos...