I recently found a super high quality scan of House of M. It looks better than even the comic books that I have of it. It looks incredibly vibrant.
Also, with a digital copy you can zoom in on panels and background details.
Have any of you seen the "Infinite Comics" Marvel has released?
I actually bought the most recent one (an interlude from AvX) on the Marvel app for $2. That is the future- it's an amazing step forward. It looks similar to some of the "wide screen" scans that are out ther only better.
I get wanting to hold it in your hand, but Marvel is actively working to add value to being able to read comics online. It's pretty exciting.
These are features I really enjoy when reading digital versions, although I also still like holding the comic in my hand and just peering at the background really closely.
I think both formats have their pros and cons, which is why I don't have a strong preference for either at this point.