I find myself using those exact same two lenses the most as well. I use the Sigma EF 50mm 1.4 for lowlight, detail shots, and shallow DOF shots, I use the 24mm EF 2.8 Prime lens for all gimbal work, and I use the EF 24-105mm for everything else. All of that gets cropped by a factor of 1.5 when filming 60FPS which I frequently do.
I'm with you on the media as well, it is so annoying to have mismatched cards or bitrates at 400mb/s requiring 2x+ more expensive media. The footage from the S5 more than meets the needs of my type of client.
As far as shooting over 30min, the S5 still has the 8bit modes to shoot longer, and they really are good enough for most situations. I shot with the GH5 and only 8bit for years; as long as you nail the WB and exposure 8bit is plenty for most situations. I do also love the VLOG, if you haven't tried it yet you really are missing out; its incredible how much you can push and pull the LOG footage in post even though it is compressed.
With my Davinci Resolve workflow, I can grade VLOG footage in seconds.