Yeah, glass is where it's at. With so many lenses I wouldn't switch.Truth is, the first time you buy a big glass, you have just committed to that brand.
I don't have the skills to justify the price of those. ?Red Rings are Canon's Pro glass.
mmmmm, Leica...I've shot with Canon, Nikon, Olympus, Leica, Contax, Pentax, Rollies, Hasselblad, Sinar, Speed Grapic, etc, etc. All take a great picture if the operator is any good. All take a lousy picture if the operator sucks. They all have their strengths and weaknesses. I like my Canon set up, works just fine for me.