Here's a video I just saw. It's made by Ole Jorgen Liodden of www.canonfieldreviews.com.
This is how it looks like through the viewfinder.
Just look at the speeeeeeeeeeeeeeeeeeeeed. Listen to Ole Jorgen Liodden's reaction at the end. LOL. This 1D MkIV sure is making me itchy. If an armored truck or something overturned and exploded with money bags strewn all over the road, I think I'll grab a few of those bags and get myself a 1D MkIV too. Hehehe. It would complement my 5D MkII perfectly.