Nice summer vibe! As expected, Iray produces less realistic output compared to OpenGL. But more true to the original materials. What resolution is this btw? Faces, especially at a distance, may need a larger resolution... Appreciate the comparison!

That's the Iray default at the 1800 setting. It's generally my default. This makes it a direct comparison to my OpenGL image.
I have a big Lian Li case, 10 internal fans, and a RTX 5070 TI 16GB, so the higher resolution isn't an issue. A 4000x6000 Iray render never pushes GPU temp above 50C, nor takes longer than 25 minutes.
That's a good tips about faces and resolution though.

Superb scene