After thinking long and hard I sold my entire m4/3 outfit and used the cash to buy some Nikon gear. I tried very hard to like m4/3 but the challenges of image quality, DOF control and robustness made the decision to concentrate on my Nikon gear an easy one. I thought that semi-retirement would allow me to work with smaller, lighter m4/3 gear but my remaining customers are among the most demanding I have ever had. They are used to the 'look' of full frame images and that's what I will continue to give them, using Nikon D800 and D600 bodies plus my cherished 13.5 MP Kodak DCS which is still going strong after nine years. I'd like to thank everyone who engaged me in discussion here, sometimes with passion and not always with understanding. I suppose it is difficult for people who have invested a lot of money in m4/3 to accept that it has serious shortcomings as a professional tool while remaining a good choice for the average amateur who doesn't want to lug around heavy full frame gear. Every system has its strengths and weaknesses and m4/3 is no different. The future for m4/3 looks very uncertain with substantial drops in 2013 sales figures from both Olympus and Panasonic. I hope that the two firms will continue to support the user base for some years to come.