I don't know if anyone will ever make the "perfect" camera, but Olympus has come pretty darn close with the EM1 Mk II. This little thing has great image quality, an incredible feature set, and it won't break your back carrying it around all day.
First, my nitpicks with this camera. After coming from Canon's 5D3 and 7D2, I'm used to highly customizable top-notch AF. The E-M1 Mk II has excellent AF, but at this point it's not quite to that level IMO. Of course, this could probably be remedied with firmware and more experience on my part with the new body. My main gripe is that there is no "small" AF point anymore. My wife's E-M10 II has it, the original E-M1 has it... so why is it missing in the E-M1 Mk II? Maybe there's some technical issue, but it's a big oversight from Olympus. Second, the tracking is good, but isn't quite as advanced as Canon's, but that's to be expected I suppose. I haven't put the Olympus through a ton of AF tracking testing, but with my daughter's softball season starting up now, it'll soon get a workout. My only other gripe is that I've only had this camera for a few months now, and the paint is already starting to show some brassing. I've never had this issue with any camera I've ever had in the past, so it'll be interesting to see how well the finish holds up over time. Of course, a little missing paint doesn't affect performance in any way.
So why did I look into the E-M1 II in the first place? I've been shooing general photography, kids sports, weddings, and senior portraits with Canon DLSR's for going on 10 years, and I've got a roller case full of L's and other great lenses for them... but it was just getting to be too much to haul a ton of gear around all the time, especially once you add in lighting. I started hearing about mirrorless from some friends and one day walked into my local Best Buy to buy a Sony alpha to see how amazing it was. Well, it wasn't for me. I started walking out of the store and happened to pass by the Olympus section, so I picked up an OM-D and fell in love with it. The layout was intuitive (unlike Sony) and with them being MFT, even the PRO lenses were much smaller than their FF equivalents as well. I've compared the EM-1 Mk II (with Oly's 12-40 PRO, 40-150 PRO, 1.4x TC, 17 1.8, 45 1.8, and the 9-18mm) to my 5D Mark III and 7D Mark II (with Tamron 24-70 VC, Canon's 70-200 2.8 IS II, 300 2.8L IS, 85L II, 50 1.4, and 17-35L), and the image quality and ease of high ISO noise cleanup amazed me. I've heard horrible stories about MFT being noise monsters and that's certainly not the case with these newer sensors. Sure, they'll probably always lag a bit behind FF, but they're certainly more than adequate for most needs. While looking at a selection of images, it's really hard to tell which ones are from which camera! Sure the FF has a bit less DOF and a bit smoother bokeh for a similar angle of view, but the MFT is no slouch. I'm extremely pleased with the performance I'm getting out of this tiny little package.