It corrects the one thing that broke it for me, the apparent geometry of the wall is now vertical. What adjustment did you make to get the correct view?
Remember, you have the use of 4 GBs of RAM for materials in addition to the card which only has to deal with geometry (not instances). This is available on Octane 3. You might have trouble finding a high end card as so many are being purchased for blockchain (bitcoin) use.
The world (your scene) can get really complicated. Yes, Forester is top-notch. also, Octane renders things so fast that it can be used instead of the slower viewport to see changes.
The last (closest to grass) image passes well for me. Hair would help on any closer shot. I agree about the stairs, too steep. A banister that hit you just under the armpits would help getting up and down.
All of us would be lost on this machine. In those days, I paid $400 for a 2 inch B/W portable scanner. The dollar in those days was worth much more for food, clothing , housing , etc. but not for electronics.
Immagine the beast you could buy with a budget like that.
The best tool for this was/is Cactus Dan's FBX tool that he used to go back and forth from C4D to Maya. How you could get this now is not known to me except if his heirs were to arrange for the continued (though unsupported) animation tools he made.