I really understand your point because I work in the consumer good industry and know the reality of the injection moulding. Thats why we started the 3D printing office - mainly for prototypes - and know we are thinking about using CF filament for final parts due to the low volume per year.
My 2 Ultimaker 3 have more than 2000hrs and didn't replaced the head yet. There are some problems it's true (don't know the S5 model) but if it were me today, I would go for the Ultimaker again. If your F370 has problems you need to wait for the technician and with Ultimaker you can do it for yourself. For example, I don't ask for the re-seller's help because he is not very customer friendly. If you take care and plan your prints with common sense, the difference between two printer will pay up.
Regarding the print qualities, if I choose the proper core and settings I can achieve the same results as the F370.