I fail to see why buying an A73R is better than renting an A74R with what you listed?
So once again, why not spend $160 for a week with the a74r just to see what it is all about before committing to any kind of shift over to the a73r or a74r? I still haven't really seen a reason for the "no" you replied with on my original reply.
I am certain any reasonably intelligent person could figure out the Sony camera settings and controls within 24-48 hours, and be able to produce great shots and process them within another 24-48 hours, and the remaining time to play with all the different modes before having to send it back on the 7th day.
do you or anyone on this forum, rents gear for weeks at a time?
I dont, so I wouldnt recommend it. It's one thing to rent gear you're familiar with, another to go try something completely new and hope to learn it in a week or two. It's not going to happen that fast, you can ask anyone on the Sony board, all were pretty much past Canon shooters, how long it took them to really figure out the system. Depreciation is a much better way to approach long term rent, which you sorta need. I used Fuji for a month, and that thing was suppose to be easy, and at the same time, I cant say I know it very well. I cant say if the colors are magical or not, but everyone swears by it. AF felt sluggish, but then again, I dont know all the nuances. I really dont talk about fuji anywhere on this board because I dont know it well enough. lenses will be lenses, it doesnt take much for me to figure out that the fuji zoom felt better than a comparable sony zoom, but the body behaves differently enough that it takes some discovery.

. A 5Div is technically capable of pretty much everything, it's just annoying at many things and lacking in features you may desire.
Then yes, don't even think about renting, go get that A7r4 at a huge discount!

Once you get a shooting pattern down, you can whip off several images very quickly, which is key, besides locking in your exposure up front and not letting anything change between all the shots. I can rattle off a set of 12 or so within seconds. You overlap about 1/4 of each frame's sides.

The store manager/friend didn't let me buy it LOL!!! Voice of reason was less dynamic range than my A73 and apparently noticeable lower performance in high iso performance and his awareness of my style and needs in photography (disclaimer..... I'm waiting to see what an A9mk2 and A7r4 will look like).

