Z4 vs F-type
I've only had a few sessions of V8S test driving for comparison to my prior (2010) Z4 35iS. The Jag had more torque and thus, better pull in all gears. Much better sounding exhaust, better ergonomic fit and feel and a better feeling tranny. (true auto vs TDC) The jag's steering feels much better, too.
The Z4 has a better trunk, very light steering (too light) and feels much lighter. The Z's ergonomics were good too, but now seems a bit dated.
You can't beat BMW's 4 year service program, which Jag does not offer.
Overall, I'd now pick the Jag, but need to test the V6S to really get a better comparison.