Pentax, K1, came so close. I have used one for 2 years now for Milkyway work. But have slowly moved to the D810A.
Biggest issue with any camera/lens is coma, and most fast wides have it, and many P1 not so fast wides have it. Coma ruins the individual stars towards the edge of the frame, with butterfly wings and other aberrations.
Pentax, with the K1, since it has IBIS, allows for tracking the stars for up to 5 minutes. This allows you to get past your F 1.4 to F 2.8 range and move to more like F 3.5 to F4, much less coma. There are two issues however:
1. retofocus lenses (most wides) only track in the center of the frame
2. White dots.
The first issue really effects the shot as you still get trails towards the edge of the frame. Center, when in good focus is amazing, both with details and clean files, but you still see normal trails with 14mm, 20mm, 25mm and some even on 35mm with a 50mm, not an problem. In my area you can't get much with a 50mm lens, and you need a 14mm, so much of the astrotracker, feature of the K1 is ruled out by distortion.
White dots, which Nikon quickly resolve on their D810 (uses same sensor as K1), sadly Pentax never fixed this with firmware, so the longer you go the more the white dots appear. Capture One can remove a lot of these without star removal but many times I want to use LR and nothing on the Adobe side will get rid of it.
The D810A has a cleaner base ISO, and can get similar results, and since your exposures are max 17 sec, few to no trails.
If you want to do traditional star trail work, which I prefer since you can use the moon for illumination, any camera works well. Just need a good work flow and clear night sky. You can read more about that workflow here, in a article I wrote a few years back.
http://photosofarkansas.com/2014/09/23/092314-using-stacking-for-better-night-photography-results/
Lot of fun, but a lot of work in post, and most folks seem feel it's all fake anyway (and much of the current Milkyway work does involve some near fakery with the combinations, but it does look nice.
To me MF is totally overkill. Even star trail work, (due to the stacking required and huge file sizes which create a massive smart object). But I have respect for those like Craig Stocks who have taken the time to create a workflow and have produced some really nice shots, (some of his have been posted on this site). Overkill for me as MF wides are not fast enough, F 3.5 being the fastest P1 I know of and the gear is just harder to work with at night in total darkness, unlike 35mm gear.
Paul C