Nate Weaver
Veteran
I think it mostly comes down to image, rather than spec. Alexa generally looks like cinema, or what you might expect from a feature. F3 just looks like HD video- and that may not be the kind of look that DP's or Directors are going for depending on the project.
I don't how much I can say just yet, because my test material didn't originate from me but...
I JUST (as in, within the hour) put some F55 raw through Resolve 9.1 using the Sony raw ACES IDT, and I think if enough people see it, it will change how they think about Sony. It's a much different look, and at least on par with Alexa IMHO. Just my comments though, I don't know how many will agree with me.