I'm sure it is a great lens, but a Robin Wong review is not the place to find that out. We've been through this issue before with the "Robin Wong comparison of Oly and Panasonic 25mm lenses" thread.
If we want to know, before buying, if the lens has any little foibles or less-than-stellar aspects (I am sure there wont be any actual weakness), then we will have to look elsewhere.
I'm always careful approaching RW's stuff...BUT....the sample images speak for themselves, he's up-front about his employee/f.anboy (let's be honest, he's a bit of a f.anboy...as are many of us, nothing wrong with that!) status.
That bokeh/sharpness is amazing! M4/3 is definitely hanging with DSLRs (even FFs) and mopping the floor with the rest of the mirrorless market!
EDIT: Haha...I can't believe "f.anboy" is censored. Anyways, I'm leaving it in not to break rules, but because I mean no offence or harm by it.
I do believe Robin is the right guy for the job..........his experience is key, great work. Anyone else would be in the same hot seat..........I like his writing style, don't hear a big sales pitch, just a great Demo of the equipment most here like, Olympus!, as I like the 40-150mm of what I have seen or heard so far...... Order up!!!