The built with full weather sealing is fantastic as I tend to shoot in the desert a lot

It's as well built and sharp as any Canon L lens; all I wanted to throw in here is the focusing performance in low light.

The build on this is amazing

Great construction, very solid build, complete with rubber gasket

Ultimately this issue attests to the fact that autofocus is never 100% accurate with any lens, but I see less misfires with my Canon 50mm f/1.4 and my Sigma 85mm f/1.4 lenses, so the fact that this L lens with a steep L price cannot autofocus consistently is a bit disheartening

I made the plunge and dropped $1529.00 down for my first L lens and boy, what a disappointment!

It is classic L quality, both inside and out