I was recently shooting landscapes with two cameras the Olympus EM 1 and a Pana GX 8 using the same lens a Pana 12-35 F2.8. The EM 1 had great difficulty focusing if the setting was overcast with fog. At first I had to use the focus aid in the EM1 and manually focus each picture. The GX 8 did not have this issue. Auto focus under the same conditions with the same lens workd perfectly with the GX 8. Has anyone else had this kind of issue with the EM1?