Olympus has acknowledged the banding that can appear in high ISO OM-D E-M5 images shot with the Panasonic 20mm F1.7 lens and says it is working on a fix.
Statement from Olympus:
"After checking every possible combination of a body and a lens, we
found the phenomena only with this combination (OM-D, E-M5 coupled with
the Panasonic 20mm pancake lens). We are continuing to study how we can
eliminate this and we recommend for our customers using E-M5 with
Panasonic 20mm pancake lens to keep a low ISO to avoid this problem for
the time being."
Mind you, with all that camera sold and being the hottest selling M4/3; there are not many complain, don't believe me? Just go and Google "OM-D E-M5 may show banding" and you get ONLY 12,000 results, wheres "Canon 5D-III light leak" return 314,000 ;)
So imagine my surprise when my friend Chris Bing show me his E-M5 is having banding problem of a different kind!