One could certainly say that. Porn has always been at the forefront of the latest video tech - except when Blu-Ray came out, because domestic Blu-Ray replication was locked down to a few companies and not within reach of the industry - and it's no different with 4K, though I doubt that porn will be on UHD-BD any time soon, if at all. Many studios have been shooting with 4K digital cinema cameras for years and websites have recently adopted 4K camcorders or digital cinema cameras to shoot their content. Unfortunately, there are only a very small number of content creators putting out UHD downloads, so I can't say that they are really "embracing" UHD like they did HD.