The seat is close, but I don't think as good as KL. It's similar to the new 767 seats - 50" pitch, 145deg recline, and 2-3-2 downstairs. Food is miles better. The lounge in KUL is lovely.
On-board service is different to KL's: more professional and consistent than KL, but less personable, I think.
Where MH shines is in Y. The Y seats and services are above any airline (OK, maybe NZ) I've been on.