Kind of hard to dismiss 1.25 stops as "not THAT much" if you ask me. In the dark, that's the difference between ISO 3200 and ISO 8000. Or in other words, usable vs noisy garbage on most m4/3 cameras.I would say that of all the lenses discussed, the 12-32 makes the 14/2.5 redundant. It's not THAT much brighter, and there are better primes than the 14. The 12-32 is more versatile.
The 14mm is also the smallest lens for the system by a good margin. It's seems significantly smaller than the 12-32mm holding them in my hand together (not that the 12-32 would ever be called big!)
And it's kind of nifty that you can turn the 14mm into a 10.5mm f2.5 lens with affordable WA converters. 10mm f2.5 is not something you can easily get elsewhere.