They weren't able to test out any lossless Dolby TrueHD soundtracks, but uncompressed PCM soundtracks on Sony Blu-ray movies blew away their lossy DD and DTS equivalents.
"Deluxe Digital Studios recently installed Dolby TrueHD with advanced 96k upsampling after we conducted a blind test, and everyone agreed the upsampled stream was better than the original, " said Roger Fiets, Technical Manager, DVD and Blu-ray Audio, Deluxe Digital Studios.