Just saw a review of the LPGT Ti from an audiophile in China. He is from one of the major Hifi retailers so do take this review with a grant of salt.
The build feels very nice and premium; a significant step up from the original LPGT which already has an excellent build.
The improvement in both 3.5mm and 4.4 output from the original LPGT is large, particularly the 3.5mm output.
The author of the review primarily tests the 4.4mm output with two full-size headphones: ATH WP900 and Sony Z7M2. The difference to him is huge, simply because the original LPGT lacks sufficient power to drive these full-size headphones. With LPGT Ti in high gain, the sound is much more dynamic, rich, and the overall "control" in music presentation is a significant step up. However, it is also even more revealing than the original LPGT, therefore requiring high-quality music files. I think the reason is, again, primarily because it can now appropriately drive the full-size headphones to reveal all the details.
Finally, for the IEM Sony IER-Z1R, the original LPGT reaches 90% of its potential but the LPGT Ti is even better.