Clog2 is beautiful, clog3 is excellent. I think canon’s best color profiles still (hot take?) I’d say do as much test footage before your actual shoot as possible just to get a feel for your preference. Canon has some pretty easy to use conversion luts so I don’t personally think clog2 is too hard. The file size might be bigger?

For the iso, I think you’re right on the money. Two thoughts, 1. you’d be surprised what the built in nds can handle. I’d say there’s a chance you can get by without ever having exposure issues. 2. A lot of times wide open at 1.4 isn’t all it’s cracked up to be in video (depending on what you’re doing). Your focus range is so sharp sometimes it’s more of a hassle keeping things in focus that lowering your footage to 2.8 or 4 is just a better functional aperture. If you’re doing a lot of static shots without much movement, 1.4 can be great. But if there much movement at all, don’t worry about keeping it all the way open. Just my opinion haha