Today I finally received the 24-105mm F/4L IS USM lens. This is my first canon lens for my 7D and it does not disappoint! I'll do a full review of it soon (I'm thinking this weekend).
This lens is huge and heavy! After it was mounted, I wasn't sure if the lens was mounted to the camera, or if the 7D was mounted to the lens, that's how big it is.
This lens reeks quality. As a pro-grade L lens, it lives up to its name with an impressive build. The zoom and focus rings are smooth and there is no lens creep. It's also weather sealed with o-rings nad grommets to protect against moisture, rain, and dust (provided you have an equally capable body). Everything is made in Japan, even down to the lens hood and lens cap.
The lens cap (must be a Canon thing) has two small hinges on the outer rim making it hard to put on and take off when the lens hood is in place. It's a nice looking cap though, just not highly functional.
The lens hood is plastic and feels quite cheap, particularly for a lens like this. The high end Sony Zeiss Alpha lenses have metal aluminum hoods (24-70mm CZ F/2.8 Vario-Sonnar). They also cost like $100 to replace at B&H. The hood though does have an impressive felt finish on the inside like the Sony Vario-Sonnars. I'm not sure what the felt does, but it's nice. (Probably cuts down on further reflection?)
Lens balances the 7D well.
Image Stabilization with IS works well. It's interesting to see how lens-based stabilization works. I'll have to get used to the floating in the viewfinder.
Snappy AF that is pretty fast and works well to focus in low light and low contrast situations.
Edit: I lied, the cheap leather case that comes with the lens is made in China. I'm not even sure who would use such a thing, but in case you cared, it's from China.
I will explore more little details later and give more sample pictures!
Photography 
