a) the internal pads are of lower quality than the S C4Pro. For the S C4 they were developed and manufactured by an Italian company, the inner pads of the S C5 are already manufactured elsewhere and are noticeably less pleasant to the touch. What if they sweat?
b) the inner shell: the S C5 fits me much worse with the same XL size, the S C5 helmet fits me "almost to the neck". The same size on the S C5 is anatomically different (for me a shift for the worse) than on the S C3/S C4Pro. And the smaller size L didn't fit me anatomically at all. Note that I've had the S C3 (by far the worst), then the S C4 (better), then the S C4Pro (much better) and now the S C5 tried on for about an hour - that one is bad for me.
And deal with it with more padding? The ones from Schuberth were never properly available even on earlier versions, so I'll wait a year for the extra S C5 pads? And then what about when it doesn't fit me even with the pads? Am I going to cut them out of styrofoam and cover them with upholstery fabric? For a helmet in this price range?
c) Control/communication unit: no longer user replaceable, only battery when discharged. The Schuberth C5 SC2 Sena / Mesh 2.0 unit has to be charged directly via USB interface either in the helmet, or the unit can be removed and this unit can be charged externally. So will I carry a powerbank with me, or will I look for a charger somewhere on a table at the gas station? Now with the S C4 Pro I carry two spare small and lightweight batteries in a bag with fuses and tire glue for long rides, changing the S C4Pro battery takes 10 sec. One battery lasts about 600 km. If my new S C5 runs out of power, I'm sure it will take much longer to charge with a powerbank or otherwise. And I have to physically take the helmet with me to the desk.
d) the new microphone placement on the neck in the area in front of the mouth and chin on the S C5: supposedly this is at the request of riders who like and often ride with an open helmet and talk constantly. Well, in these geographical parts where I ride, I don't really ride with the open part of the helmet that often, and if I do - in city traffic - I don't feel like I have to talk into the microphone and swallow smog and dust particles from the surrounding traffic. I ride very, very little with the open part of the S C4Pro. Rather, I raise the visor. Further, the call quality of the S C4Pro with the microphone slightly off the centerline of my mouth on the left side is very good, so I don't need the microphone sticking out in front of my mouth like I do with the S C5. This system is also, in my opinion, less comfortable when putting on the helmet, quite often the chin part of the microphone catches on the neck, for example. And then you have to use your fingers to flatten it out from underneath once the helmet is on. It's not so good. In conclusion: the above are just my impressions and evaluation. But I've been riding with Schuberth helmets for a very, very long time, so I think I have something to compare it to. This new S C5 will 100% not be my next one.