I finally found some real world comparison from a fellow member Atif, with permission:
"I have both the Schroeder SQ for my mono setup and the Schroeder LT for my stereo. Both arms are excellent. Very dynamic and naturalsounding. Tonally perfect and airy and 3-dimentional. The LT has more weight and authority in the base. It also does everything at least a little better than the Sq especially in the inner grooves of a record. I've been a happy longtime customer of Mr. Schroeder."
"I have both the Schroeder SQ for my mono setup and the Schroeder LT for my stereo. Both arms are excellent. Very dynamic and naturalsounding. Tonally perfect and airy and 3-dimentional. The LT has more weight and authority in the base. It also does everything at least a little better than the Sq especially in the inner grooves of a record. I've been a happy longtime customer of Mr. Schroeder."