"destroy almost every DSLR made today in the quality of the final result" why would you say this? The GR1 has a decent enough lens if you are happy with just one, but 28mm doesn't suit everybody, and f/2.8 is not always very useful, it does guarantee the lens performs reasonably well wide open though (it's not a very ambitious lens), but most (full frame) DSLRs have higher resolution that that camera. You need to use medium format to beat a D810 or Sony A7r today. I am not saying film isn't great, I shoot film, but it's just plain wrong to go through life, or try to convince others that your little GR1 can beat a Nikon D810 at anything. You need to use a lot of scanning technology to eek out much resolution from the 35mm negs, even dynamic range is better in the FF digital cameras now, and as for ISO performance, film cannot even dream about keeping up. The A7s can shoot in the dark, by starlight!!
A hasselblad 500c/m with its 6x6cm negative will have more tonality and even on a flatbed scanner will have slightly higher resolution that a D810, you'll need an imacon scanner to really get the full resolution of film.
The biggest challenge with film, besides the poor ISO performance compared to digital is the cost.