@chakster The 100MK2, while similar, has a noteable difference. The bearing pivots on the 100 are spring-loaded and hard-chromed. The 100MK2 uses the same pivots as the B500 which are not hard-chromed nor spring-loaded. The spring-loading doesn't serve any practical purpose. The pivots can be surfaced and polished to perform at the level that can be achieved with the EPA-100 but aren't quite there as-deliverd. They're also more prone to corrosion.
A bit more than double the VTA range which is nice. CW and AS are the same, and on the MK2 it's easier to tailor cables as they're RCA rather than DIN. Wtih some TLC they very nicely.
I believe the Japanese generally prefer the original, and it certainly as a more traditional feel to it. My daily driver is a B500 with surfaced and polished pivots and Si3N4 balls for 100-level performance with the conveniend of detachable armwands. Once used to it, the ergonmics of the 100MK2/B500 is really nice.