Franzo,
The nice thing about the OMD system is that above water it's a great system too. I'm a professional photojournalist and use Canon (1DmkIV and 1DmkIII) at work. I also own Nikon pro gear for my personal gear. Recently I picked up the OMD as a new uw camera. Stuff happens and I haven't been able to pick up my Nauticam housing yet. However, I use the OMD quite often in my pro photography. With the 40-150 lens, it allows me to carry a really small 300mm equivalent camera around my neck without adding a lot of weight to my overall kit. Granted, this lens is pretty much only usable with a lot of light, but I have run the ISO up to 4000 and, for newspaper work, it's quite usable. I'm about one really good camera in the micro four thirds format away from dumping my Nikon gear for the smaller but very usable system begun with the OMD.