Yes, the gens have sharper lines on the case (while still having curves and slopes). Only the recent DSN cases match this aspect, the standard rep cases do not. Gens also have better/clearer crystals and better quality AR. Dial printing is sharper, crown is sharper and more polished, these all small details that add up to give a better overall feel to the watch. It's the difference between seeing a rep on a wrist and thinking "wow, that's a cool watch", and seeing a gen and thinking, "wow, that's a NICE watch". The latest DSN's will get you closer to that quality feel, but even they are not quite at that level. Quite close, but still just short.
If you really want an eye opener, compare the rep 212 to the gen 212, the gap is much larger than on the 111 or 005, the 212 gen is amazing in it's overall level of fit and finish and feel of quality.