Does anybody have experience training/finetuning Real-ESRGAN models? I downloaded one of their datasets to see what they are working with, and it has 800 images

Does anybody have experience training/finetuning Real-ESRGAN models? I downloaded one of their datasets to see what they are working with, and it has 800 images at ~3Mp resolution. I am curious if others have results based on higher resolutions + more/fewer images in the dataset? I would like to use it for fine art paintings by period / style, etc.