Sigma is rumored to announce its ART series of lenses for M4/3 mount, we have seen earlier that its ART lenses quality is bit better than Canon L series Lenses (see here) and almost as good as the $4,000 Zeiss Otus (see here).
The some of the upcoming lenses have fast aperture range compared to the currently available M4/3 lenses, no more specification details available… we will update you soon as we get any new info.
You can also see – More Sigma ART Lenses Coming
as seen on 43rumors.com
How about another test of Weather sealingfor the two lens ?