Wait a minute Mr. Postman, I forgot to thank you personally for the little black box that showed up on my desk this am. Sure glad my front office staff who signed for it didn't open my box, and even more glad Neuro wasn't there with HIS truck.
Full comparisons with other bodies soon to follow, but over lunch I shot same centerpiece with 5d3 and 1Dx using same settings , and first thing I noticed, using Av, evaluative metering, single point, single Shot focusing, the 1Dx metered to slightly different/faster shutter speeds across Iso range 100-100,000.
Haven't pixel peeped yet , but trying to achieve same settings was hard. W/o EC, the 1Dx was 1/3-1 stop faster in AV mode.
Also ISo to 6400, 12,800 was very clean in Jpeg ( though I S___ both raw/jpg), I haven't developed yet in LR, though nice to know LR 4.1 opened native raw flawlessly!!