Cry engine, modding wise is the best otimisation i've ever seen, since they crowbared Crysis 2 onto a console, while being better then the PC trail by fire Crysis.
not to mention it does LOD, armatures, particles blah de blah de blah, so not only does it look miles better, using some clever shortcuts and a bit of work, i'd bet you dollars to doughnuts it'd outperform OGRE
plus pryrotechnic spark emitters so we can make randy's FABULOUS sparkly digger