watch your feet, and or tripod legs! :p
I have the older, MUCH cheaper f4.5-5.6 version and it works well.
The f/4 would be handy for the slightly brighter vf in low light(I have a faster focus screen fitted to the D800E!)
If it's better than the old model(the Mk II version!) which I've read it is, then it'll serve you well.
minimal barrel distortion at 12mm(handy) and zero distortion at 14mm(great if you shoot scenes that need straight edges)
I won't update until the price of the new model comes down a bit(which they always do) .. ATM it's at (AU) $1800-ish. Maybe when it hits $1500-ish I'll hit the buy button.
Note tho: I'm reading that the Zero Distortion 12mm/2.8 from Laowa has produced some good results too tho.
again, the f/2.8 is handy for my D800E(darker fast focus screen!) for use in low light.
problem is the price they're initially asking for it(close to $1K) for a manual, barely known manufacturer.
The other benefit I (personally) find about the Laowa 12mm is that it will have a factory made filter holder accessory.
I'm old school in that I prefer physical filters to virtual filters and multi image layering.
For my old model Sigma 12-24, I cobbled up a filter holder using the Samyang 14/2.8 filter holder they made as an accessory some time ago. It's slip on diameter is exactly the same as the diameter of the (old) 12-24's built in lens hood.
Only problem with it was the weird and rare Cokin 163mm(wide) filter holder slots, and what I cobbled(easily) was two aluminium strips, removed the filter slots on each side of the holder, and mounted the aluminium strips. then remounted the filter slits closer in to hold 150mm(6") wide filters. I have a small set of Hitech 150mm filters to use on it.
Note again: 12mm is not fisheye territory, but it almost feels like it .... but it's rectilinear. Just watch your feet(and or tripod legs!)
I think I remember that you do some really nice, and interesting landscapes(Atacama, etc) and would take good advantage of the very wide perspective this kind of lens allows.
I'm convinced that this lens would work for you as long as your not super fussy/pedantic about the extreme corners of the image in terms of pinpoint sharpness!
apologies for my perspective coming from a non user as such:
Having had the chance to compare Nikon's 14-24 against my 12-24, and even tho the (old) 12-24 is not as sharp at the corners, both myself and the owner of the 14-24 both noticed the wider FOV that the 12mm allowed.
Central sharpness of the 12-24 actually looked better on both the D800(his) and my D800E compared to the 14-24. But corner sharpness(around the last 20% of the frame) was definitely down.
And my thoughts are coming from the expectation that the new f/4 model of this lens would have to be a lot better than the old model(ie. that I have) .. so I'm pretty much convinced that you won't hate it.