the metering system in the 7D is also noticeably improved. the 7D is a great camera.
A review of this lens:
The graphs look pretty normal - peak in lens resolution at somewhere around f/5.6 to f/8.0. For a landscape shot, at f/8 or f/11, it's going to be pretty damn good.
Interestingly, even though the center peaks at 8.0, it is also at around this point when the entire image is of similar resolution - exactly what you want and need for a good landscape shot.
To read the graph in a different manner, if you're shooting portrait at 2.8, looking for nice bokeh with your subject centered then the drop off in resolution towards the edge is not going to harm the picture at all.