If your R8 had the same color sideblade as rest of body, would continuation of side glass shape into upper region of blade look O.K.?
i agree. the different colour sideblade makes the R8 stand out from the other cars on the road. with a quick glance, one could confuse the R8 with a TT by mistake. this is also why(among other things) i don't like the new roadster version.IMHO it looked rubbish (isn't the contrasting sideblade a standout feature on R8) but YMMV.
For example just look at the electric R8, basically the same core shape but utterly ruined by the lack of vents and SB....
There was a program on the Audi Channel on Sky and the designer was talking about the blade and how it was meant to delineate the difference between the cabin and engine parts - designer BS to me - it just looks 'right' in my eyes...same color sideblade is nice.. however the contrasting sideblade is nicer It's definitely one of the signature features of the R8