I admit I always focus on the part closer to me (it's usually also much easier since there are more details to be seen). In this case I was at around 30 meters and that's why I posted the picture. You said F2.8 should cover in total sharpness 2.4 meters from that distance so basically F4.5 like in my case should cover more (couldn't go higher because of the polarizer) but it's pretty obvious the front of the car is not sharp anymore, and not just slightly.
I only used F2.8's 16-25 and 24-70 and and such focal lenghts it's perfect, but I fear for a "long" 3/4 subect a telelense at F2.8 is a bit borderline if you want the full car sharp.. that said.. it's better to have only part of it sharp than everything blurry because the lense can't reach such apertures
