It's been almost 8 months since I posted this pictorial.
Meanwhile I have upgraded my watch with K2222 double AR, ETA DW's and a OEM Big Pilot strap, which really is a big improvement.
When I - for some reason I forgot - took the dial off the movement I found out that the quality of the dial painting sucks. In the pic on the left you can see on the edges near 6 that the paint got off. Also when another member tried to relume the hands of his 3717, the paint fell off too. Be warned that extreme care is needed when you handle dial & hands.
I ordered a replacement dial from Angus (on the right in the pic). It turned out that the text 'IWC Schaffhausen' and the markings and numbers on the subdials were painted 'greyish' off-white instead of clear white as on the first batch and gen.
There also seems to exist another new incorrect version with thinner 3, 6, 9 & 12 markers (good!), but with the numbers 1, 2, ...11 lumed (wrong).
So far it seems that the first batch of 3717s (from EL?) are still the best. If you have one.... you'd better keep it.