I sold my Mark II and bought the 60D when it came out to be able to purchase nicer glass. I purchased the 24-105 and it works perfectly with the 60D. I love the live features to be able to get the perfect lighting before shooting a scene.
good battery life; quiet; Nice features/settings; Quick Start-up time; excellent image quality; Bright LCD; Solid Operation; Lightweight/Portable; Simple controls/menu; easy to use
medium build quality