Many by me, in fact. Yes, G&G is the Chicago lamb chop king.
PS, a quik look for pics of G&G lamb chops led me to Yelp, which didn't have a photo but did demonstrate how polarizing G&G is. Most of the ratings were very high or very low. Some of the low ratings pose valid criticisms, many are inane -- Brian K of Hoffman Estates gives one star and sez:
"There's a CTA train right outside, and it's really nothing very appealing. The table settings were pretty nice though."