Shipping body and lens to Canon will be expensive (meaning shipping + insurance on $10K of gear, the service would be free). Before taking that step, I'd definitely try a proper AFMA, assuming you haven't done one (by 'proper' I mean Reikan FoCal, LensAlign, SpyderLensCal, not a DIY setup or taking random shots then tweaking the setting and trying again). The lion shot looks front focused, as does the 'soft' shot from your window. My interpretation is that the sharp shot from your window is actually a miss on correct focus, not a hit, according to the AF system. Phase AF isn't perfect - depending on the subject features, contrast, and lighting, a 10% rate of misses is not unreasonable. That percent is higher on lower end bodies, lower on the 1-series, but misses do occur. With a properly calibrated system, the average of a whole bunch of shots is right at the correct focal plane. In your case, the average (your 54-55 shots) is centered away from the correct focal plane, and an occasional miss randomly hits correct focus. That's the situation that AFMA is designed to correct. But again, a proper AFMA method is required.