Yup, I can confirm that, I saw Macca last week in Berlin - a nice rocky show, not at all Nokia Night of the Proms as you might fear. Paul's Höfner sounded excellent (not his old model, but some new model with binding Höfner no doubt custom-built for him), but whenever that Duff McKagan deadringer in his backing band played the SG RI, you heard more fundamentals, more mids and presence AND A LOT MORE SUSTAIN. The SG RI was just more there and melodic runs in the upper register had definitely more tone to them. That is not knocking the Höfner which does a good job, but it is just more limited in expression than the SG RI.
Incidentally, Macca's voice was in a lot better shape in Berlin than in the above video where he is obviously battling on the piano verses. A memorable moment was when he strummed a bum note in Blackbird - plainly obvious for even the most unmusical - and got mid-song applause for it. See how unfair the world is: Once you've been a Beatle, the public even cheers your mistakes.