Just look at the spec for the dimensions. thier listed on the erman HK site and I believe even on the HK-USA site.
The grips is blocky kinda but I don't consider it overly large. It's a double stack so it's not 1911 thin.
I have the full size, a compact and also a XD and the fullsize is well, fullsize. Larger than the XD for sure but Not large. I have average sized hands and it does not feel too big in my hands .... you have GOT to go grab one somewhere first hand. Words can not fill your bill. HH