I've been following this forum and issue for over a week now, and, sadly, I finally caved and picked up an XBO X to resolve it. I work long hours at my job, waiting patiently for months to play this game, and am just tired of the day-to-day suspenseful wait to simply see whether Rockstar *is aware* of the issue.
To whoever is doubting whether it's a legitimate issue on the PS4 Pro you're absolutely wrong. On the Pro with HDR the game is so muddy and blurry it looks like someone took a saturation and sharpness slider and dialed it back to -100. With HDR off a blur can be seen on character's faces and nearby objects in buildings that eventually becomes so distracting it will hurt your eyes. In 1080p the blur goes away, but the overall image quality falls noticeabl, with hair on head or horse looking pixelated and fuzzy to such an extent it looks like a PS3 game.
I was prepared to be brutally honest with myself in determining whether the purchase was justified; the answer was clear within minutes. Image quality on the X has improved in all aspects substantially. There are many more details I wasn't able to see on the Pro: glitter on snow, a glow and flicker of candlelight, and lush facial animations. Overall, everything has become sharp and crisp.
So to those questioning the legitimacy of this issue, don't. It's incredibly frustrating for anyone involved, and even though I have the correct experience in hand now, I definitely feel cheated. I'll play the game at least twice in first and third person and hopefully use the console for higher definition movie-watching, but hope this issue is resolved is resolved soon for those still stuck in wait.