Been playing the 2011 PS3 SotC 'remaster'. Although I was mostly interested in the Ico remaster in the same disc, SotC was the most technically impressive PS2 game of all time for me - the cloth system, the incredible animations, the scale of the colossi, down to the details of the fur system. I loved it and especially the artstyle. However, it ran very poorly (often dropping to single digits) due to to how advanced everything was - the animations, the clothing system, the fur system, the scale of the world and of the colossi, all of it. It really did border on unplayable, especially on later colossi (the last one in particular ran mostly in single digit FPS).
Earlier this year I played the 2018 PS4 remake on the PS5. Although it felt great (especially at 60fps), I thought something felt off regarding the new assets - although technically excellent, they don't accurately translate the look and feel of the original, something I felt was also the case with the Demon's Souls remake (by the same company, Bluepoint). Everything looks too clean and inviting, while the original clearly depicted a hostile and unwelcoming, barren world.
The PS3 remaster is a good compromise, I feel. It uses pretty much the same assets as the PS2 version, with very little tampering (bloom seems to be a little dialed back but I felt it was sometimes excessive in the original), and runs at a very stable 30fps at 720p/half-horizontal resolution 1080p. Although obviously falling short of the PS4 remake's 60fps, it's still quite acceptable and a vast improvement over the original version - with the considerable benefit of preserving the overall look and atmosphere.
RPCS3 runs it perfectly.
Pretty cool. I think RPCS3 made some incredible progress over the past couple of years.