i picked up the 1950 service captoes on the 2030 last 7.5 UK. my whites are an 8D US. right off the bat the vibergs are much narrower, i can only wear thin socks with them at this point but length wise they are perfect. Not a problem now as it is entering the summer season and i don't need to wear anything thicker. Quality wise they are beautiful, great shape and quality throughout. there are a couple of mistakes i have found but i am guessing that's why they were in the sample sale. a little more comfortable out the box because of the lack of arch ease in the white's (arch ease takes a little getting use to but I really find it to be incredibly supportive and comfortable now). The Vibergs only have a handful of wears on them so time will tell.
Thanks. This is my experience too: Vibergs are more like a half size difference (from US) rather than a full size, and somewhat narrow. I am a 9.5E in Viberg, and thinking I will be 10E in White's.
Vibergs are definitely very expensive (I got mine on a big sale, like you), but the quality really is something else...