http://w3.ee/openarticle.php?id=2974753&lang=est
(in Estonian, Google translated English page here)
Whilst it is commented that the Mark II has lower noise and the pictures are brighter when compared with Mark I's, the tester does not provide any information on the exposure time values of his comparison test pictures.
A quick check on another earlier similar shootout test (in Chinese, machine-translated English page here), it is noted that the exposure times of the Mark II are often extended by 1/3 EV stop and hence the rated ISO of the Mark II should not be accurate and is actually overrated, hence resulting in brighter pictures with less noise. In fact, I have seen several shootout tests so far and have found the same.