The 5D Mark IV's DR holds up against anything else on the market today unless 1/6 of a stop at base ISO is really that important to you.
I'd place 30 MP right smack-dab in the middle of "decent resolution" for stills between 20 MP on one end and 50-60 MP on the other. The files are manageable while also leaving room for sane amounts of cropping.
You might have a legitimate complaint regarding video features, but then if you're mostly concerned with video, the 5D Mark IV has way more resolution than is optimal for a 4K video camera. That's why it's cropped so severely. Get a 20MP camera that can shoot 4K at the full width of the sensor on a 1:1 pixel basis.
So that leaves IBIS. Again, if you're primarily concerned with video, aren't you using sliders, dollies, booms, etc. to mount the camera anyway?