While the images do overall look much sharper, a lot of detail is actually lost on the models themselves. For example what would look like fine hairs are lost, or the shading of the wrinkles on the balls and the vein on the shaft... they turn from shading to sharp lines. What were finer details and shadows etc before become smoothed out to nothing or sharp lines.
It's an obvious tradeoff, but I personally prefer the original, lower res images because they actually preserve a lot more of that finer detail, the subtle shading of small shadows, hints of body hair, etc.
The AI resized ones almost look cel shaded. That might be fine if that's the look you were going for, but it's not actually the level of detail the original models have available or what that VAM engine seems to have intended.
Please forgive the zoom on the junk, but hopefully this helps explain what I mean:
View attachment 2758533
Instead of the subtle shading showing the vein on the shaft, you have sharp lines. Instead of the subtle hints of the wrinkles on the scrotum, you get what looks like a very sharp fingerprint pattern.
Again, it's like cel shading. Probably wouldn't matter if people weren't looking closely, but since we're comparing image quality I thought I'd point it out.
As I said, I'd prefer the originals at this point unless better "edge detection" could be done to not do that to the internal details, and only sharpen up the edges of the models and other straightline edges like furniture, walls, doorways, etc.