I'm quite excited about this lens. I own the 70-200mm f/4L and the f/2.8L and could easily see myself selling the 70-200mm f/4L (which I bought for compactness and hiking) in favor of the 135mm. I recently picked up the EF 135mm f/2L from a guy locally selling one for $320, and it's been fun to shoot with, but its shortcomings are a bit more obvious on the RF bodies. It'll be cool to flip this one and have a native, modern, faster version. I put in my B&H pre-order this morning.
