I recently bought a Canon 7d mk II and their brand new EF 100-400 f/4.5-5.6 IS mk II lens to complement my m4/3 kit, because I shoot a lot of bird photos, and wanted to compare the vaunted autofocus tracking system to the EM-1 with the 40-150 f/2.8 pro with a teleconverter (and because I was disappointed to hear that the Oly 300mm f/4 isn't coming as soon as I'd hoped). This is my first DSLR, so I am still getting used to it, but I have to say, the autofocus zips right on birds in flight. My wife and I went to Conowingo, Maryland, to shoot some bald eagles, and the 7d mk II made catching them easy. We did okay with the 40-150 too (much better than I've experienced with any other m4/3 or 4/3 lens) but the difference was still considerable. A few days later we had some snow, and we used both camera/lens combos again to catch birds in our backyard forest (we have a number of feeders and a healthy population of about a dozen backyard bird species). It was coming on evening so the light was poor, and the birds were flitting about the dark, snow-covered branches. Strangely, the Canon autofocus couldn't handle the admittedly tough conditions at all, but the EM-1 was having little difficulty. I know m4/3 like the back of my hand, so maybe it's just that I have a learning curve with the Canon (well, I certainly do, but I don't know if that came into play here). Or, maybe the two experiences displayed the strengths and weaknesses between PDAF and CDAF. I'd like to hear everyone's thoughts on that, and in any case, it was interesting to compare the EM-1 with Canon's latest technology. One further note: I am certain I can squeeze better image quality out of the Canon as I get more familiar with it, so I'm hesitant to compare that as of yet. I'm struggling with it mainly because the controls are so different than what I'm used to. Hopefully I can customize it to the way I want. My exposure compensation, for example, is inconveniently located on the thumb dial, rather than up top. I've left ISO and WB on auto until I get more comfortable, and this is certainly having an adverse impact as well. I also only shot JPEG with it so far. So, yeah, ways to go there... I've posted some examples on my Flickr page (link below). The most recent dozen shots in the Birds album are the ones relevant here. Of the Conowingo shots, the eagle flying over the water from a longer distance was one sample from the EM-1. The songbirds in the trees appear brighter than conditions really were.