I just printed this one on Hahnemule Photo Rag paper A2 (about 40x60cm) and it is very impressive. I think, I can print it at least twice as big!
I start loving my MM :)

if you look at a 100% crop, you can count the grass near the cow:
http://www.flickr.com/photos/dierktopp/7840129004/in/set-72157627938627378