What focal length are you usually shooting this one at? I've had the 70-200mm f/4L IS for a few years and I like the ergonomics, but I'm seeing in my photos compared to others that I'm losing a lot of bokeh compared to the f/2.8. I have the 85mm f/1.8 and lately I've found myself grabbing that and shooting it at f/2.5 to make the background soft, but wondering where a lot of the couple portraits are coming in at. 85mm seems to give me decent compression but wondering how often you're shooting your 70-200mm f/2.8 at say 105-135mm.
I want to get into some wildlife this fall and I am thinking of selling the 70-200mm f/4 to finance the 100-400mm Mk I after my last few weddings this summer. the 70-200mm is nice when second shooting a wedding (my normal role) and I'm smurfing about at the ceremony from the sides and rear to zoom in, but I would think the 100-400 could cover this.


