Canson Infinity Baryta Photographique II with Epson P900 produces great prints with vivid colours and nice contrast. It has a semigloss finish.
When i first tried it, I got a sample pack from Canson, and my first print looked as you described: flat, matt, low contrast. I thought that I might be doing something wrong due to all the positive reviews I could find online. I then compared the Gamut volume of the profile to Ilford Galerie Smooth Pearl, (a paper that I had more experience with) and they were close, so no reason to get those dull results.
It turned out that I used the wrong paper from the sample, Infinity Baryta Photographique II matt, with the last word "matt" written in a tiny font. This paper uses a different profile and Matte black ink. When I used the right paper with the right profile the results were great.
I cannot compare to the previous version of the paper since I have no experience with it.