You asked
Sony fx3 vs sony a7 iv?
If you want stills and video from one body, I'd pick the Sony a7 IV. Its 33-megapixel full frame sensor gives you room for prints and cropping, and it handles video well too.
The Sony FX3 is the video-first option. It has the a7S III's sensor at 12.1 megapixels, a cooling fan, and no viewfinder. That resolution is fine for video, but it's a weaker choice if stills matter to you.
Either body takes the same lenses. For everyday work, I like the Sony FE 24-70mm f/2.8 GM II. For landscapes or interiors, the Sony FE 16-35mm f/2.8 GM II is a good pick.
Written by Claude from this site's pages.