According to Stoper himself he spends a lot of time in clothing and hair, he even uses other softwares like Zbrush and Marvelous Designer
"As far as getting help, the way DAZ works makes it rather hard to do. I've been thinking about it, and one area where I lose a lot of time is fixing clothes and hair. This is done in an external program, so passing it on to someone else to drape garments in Marvelous Designer, or fix the deformations in ZBrush would be pretty simple. But I have not seen anyone who does it to the extent I want it done."
You can evidence that in these renders, for example:
Their hairstyles are very elaborated and Shani's clothes have a lot of texture and different tones, even with translucid segments.
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Also her make up is sophisticated and realistic
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Show them grabbing those objects, the glass and the purse, in that delicate and natural way is very diffcult to achieve
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Look how Shani's hair moves here
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Her shirt is full of texture and wrinkles here
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According to DAZ artists, moving clothes position properly like in the next render is very difficult and demanding. That's why you don't see situations like this one that much in these VNs (Usually the devs show a render with clothes and the next one without them).
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A close up when you can notice the clothes texture.
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Compare how it looks a translucid blouse in JOHN and in BADIK.
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Remember the glass of wine held by Shani? Here not only looks unnatural, but like she is actually not holding it, her fingers aren't flexed.
The difference in the background's details are evident too.
Look at Isabella's hair and Jessica's one
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Not only there's a lot more texture in Jessica's hair, it's evident that DrPinkCake is using an enhace tool to increase artificially his renders resolution, almost no skin texture neither. That render is from his last update.
In terms of renders, JOHN is in a different league, if you ask me.