I only just purchased my 2013 328i E92 and I don't plan on changing cars for at least 5 years, so in all probability I'll be skipping the F32 generation entirely.
The F30 did nothing for me so I went with the E92 + M-Sport and I'm really pleased with the decision. The F32 concept looks amazing but was shown freshly detailed under perfect lighting etc. with 20 inch rims. The partially exposed F32 photographed on the truck in normal lighting looked far less impressive and not that different from the E92.
In any case, a timeless design, well maintained will always be a looker. I've seen mint condition E46s which look better than many of E92s on the road, and no doubt a mint E92 will look better than a poorly kept F32 in years to come.