from the article:
"Can the Sony A7II give you the same quality results as the M9 or M240 with Leica glass? The simple answer, yes it can."
That's not to say you can't put somebody in the center of your frame and get a very pretty shot.
I'm sorry for anyone who has been mislead by that piece. The author obviously never bothered to do much research. The result is a "fake news" blog post. With the Kolari thin filter mod you do get close to M240, but with many lenses it's still not there.
Here is a good series of tests:
note there are 3 pages of posts.
I've shot at least 30 M/LTM lenses on stock A7 and A7r and A7 kolari. I'm looking to mod a A7r2 also. I shoot M9 as my main body. The truth about A7 and M LTM performance was nailed down at FM in late 2013, and reported here. Still you have people say they are just as good as M all the time. Really incredible.
Now, all that said here is something funny: right now what is the best 35 prime for A7x? ZM 35/1.4. That's not because it does as well as a M body but because Sony does not have it together at 35mm. I thought the FE 35/2.8 would beat the ZM, and at 2.8 I'd still bet on it. However at 6.3 the ZM rules the roost according to many.