V4 has been redone from the ground up. The model consists of Deliberate, Realistic Vision, Experience, RPG, Analog Madness and CyberRealistic. There are 2 versions, Standard and LE edition.
The model tends to prefer close up/portraits and simpler prompts with lower CFG (between 6 and 8).
I would recommend using Hires Fix if you can as it really brings out the detail.