One of my favorite features of late that I missed on my G12 was step zoom.
The G1X has it. You assign it to the front dial and then you can step through 28, 35, 50, 85,100, 112mm in 35mm equivalent.
I really like this feature as I also shoot primes and I like to be able to replicate the focal length more accurately than just guessing what look close. It's also a great way to try out a focal length before you spend the money on a prime for your dslr or other interchangeable lens camera.

