I believe the R-600's and 700's are part of the "High Grade" line and are basically the same level as Ultegra.
I have a set of Sora short reach shifters on my cross bike and to tell the truth I don't find that they are much different feeling (as far as how my hand fits them that is) than any of the other ones that I have. I think I can maybe get an extra finger tip around them??