An Xperia PRO teardown video has confirmed that the US$2,500 smartphone is more than just an Xperia 1 II with an HDMI port. Not only has Sony included mmWave antennas, but it has included a huge vapour chamber cooling solution to account for its plastic body. In fact, the cooling solution is larger than equivalents found in modern gaming smartphones.
https://www.notebookcheck.net/The-Sony-Xperia-PRO-has-a-larger-vapour-chamber-cooling-solution-than-gaming-smartphones.528001.0.html