Wedding Film Maker: A7IV or FX3

Hey everyone,

My fiance and I are wedding photographers/videographers (she handles most of the photos, and I shoot the video). We have currently been shooting all of our films with an A7iii and Sigma 24-70mm 2.8, but we want to make some more investments into our gear. My two main players that I've been looking at are an A7IV bundle (used), including the camera, 3 batteries, 35mm 1.4 GM lens, and a Sigma 85mm 1.4 Art lens for $5,000 (CAD). The second is a used FX3 (body only) for $4,400 (CAD).

I'm not a huge fan of the 4K60 crop on the a7iv. I shoot a lot of run-and-gun on my gimbal and don't want to put a lot of energy into working around the crop, but the bundle is a decent deal, especially with the included lenses. We also only have the one 24-70mm as of right now.

What would you guys do? If any of you have experience with the A7iv shooting at 4k, was it a big inconvenience? Would love to hear anyone's advice! Thanks in advance!