Funny you meantion the SD-103s as I actually picked up a pair last weekend. They're fine, but I thought that they would shrink up a lot more than they did. On me, they fit very similarly to Sorahikos. I did some quick measurements post shrink and the main difference is the back rise is shorter by about 1" on the SD-103's and the lower leg is only about .5" smaller. (Note, I had to size up by 1 in order to get the SD-103s buttoned up around my waist.) Compared to the 5EPxSF, I'd have to guess that the thigh area is at least 1" larger and the lower leg is about 2" larger.
I'll try to check out the RB11s.