the abyssus 2014 also uses the S3888, like the model before it.
native steps at 1800 and 3500. the 450 and 900 steps are calculated by the MCU (using the 1800 step).
tests done with the DA3.5G (uses the same sensor) showed jitter at 1000hz, so you might want to leave any S3888 mouse at 500hz.
you could look into the PMW3310. it's a popular sensor, very flexible when it comes to DPI (every 50 DPI = a native step).