Does anyone who has these lenses know how the new zoom compares against the two primes?
As a landscape photographer, f/1.4 is almost irrelevant, and f/2 only rarely used, so the most important comparison is sharpness and aberrations in the f/4-f/8 range (although the values at f/2 are also nice to know).
The 35 Art is an excellent lens, but the 24mm is probably the weak link in the Art lens lineup.
If you don't need f/1.4, would the 24-35 be a viable replacement for both these lenses, and is there any loss in IQ at typical landscape apertures going from the primes to the zoom? What about for night landscapes at f/2-f/2.8 (coma aberrations come into play here, since you're almost invariably trying to capture pinpoint stars here).