I am tired with the noise issue of E5

Dear friends please I need your advice. I am a semi professional and I work a lot with mariages and christenings. I use the olympus E5 and my main lens are the SWD 12-60. I really have a problem with noise!!! I don't know if I am doing something wrong or I have to live with this... The image I share with you is a random selection from my last shooting. Please notise the noise especially on the dark parts of the image... Usually I hane the NR on and the NF to normal  I'am thinking, that may be I have to go to OM-D with a mmf adapter as it suppose has solved much of the noise issue and wait for the E7 to come. Any advise about this issue will be more than wellcome . The Image I share with you is at ISO 800 but I have similar problems even with ISO 500. Thank you all in advance

1/125, F4.5, Iso800