And once again, no I am not some Nikon fanboy. I have never owned a Nikon camera of any sort in my entire life.
I've owned many Canons. That doesn't mean I need to lie and make up BS to make myself feel better about Canon.
It's kinda sad that the fanboys here are so extreme that they just smite anyone and go la-la-la-la I can't hear you rather than look at facts. But go ahead, be my guest if you feel happier for doing it. 
As a matter of principle, I never use that silly applaud/smite button, but if I did you'd get a +1 for figuring out a preliminary way to get a reading on the 5D3's dynamic range. I find that there's a lot of useful information to be gleaned from many people on this forum--too bad it has to be filtered out from a noisy minority who take personal offense to anything other than praise for Canon.
Asking about the specifics of your methodology is legitimate. Crowing about the 5D3's early sales performance is indeed irrelevant.
On another thread about the pricing of the 5D3 I made the point that the sales domination of the 5D2 over competing full frame models depended largely on its prowess as a video camera. I then noted that a number of leading videographers--including Vincent LaForet--were already on record as being unimpressed by the video features of the 5D3, and that the disappointment of this important market segment might translate to lower-than-expected sales--which in turn might lead to a fairly quick drop in price.
I was assailed immediately. Laforet, it was explained, was a
nouveau riche photojournalist turned camera snob by his giddy success as a videographer. And then, having acknowleged LaForet's negative response to the camera by attempting to discredit him, my accuser turned on me and charged me with bias for saying that LaForet was unimpressed with the 5D3's specs. How many ways can you have it?
My point wasn't even about the merits of the camera; it was about the expectations of videographers and what that might do to sales. No matter. It could be construed as an indirect attack on darling 5D3 and needed to be struck down
immediately.
The clear fact is that at least initially videographers are not embracing the 5d3 the way they did the 5D2--it's all over the Internet. And the equally clear fact is that Canon cameras have a number of class-leading qualities but they have a problem with dynamic range compared to Sony/Nikon. Photographers know it. On the eve of the introduction of the 5D3, when all of the talk should have been about megapixels and frame rate, etc., this forum sprouted a 5-page thread of people worrying that Canon might not have addressed the problems of dynamic range. Likewise,all the testing organizations find that Canon underperforms in this area. How are we going to explain that away? DPR and DXO rig their tests because because Sony/Nikon own a controlling interest in them?
And while nothing is definite yet, there are reasons to wonder if Canon has been able to improve the performance of the 5D3 in this area. The company would have to be deaf and blind not to know that its customers are worried about this issue. And yet we've heard a lot of talk about the improved SNR, two-stop better high-ISO performance in jpeg, as well as the multi-frame HDR feature, but not a single official claim that I can find about an actual increase in dynamic range. DR is important to my kind of photography and I am increasingly concerned that either Canon's engineers can't figure it out or that Sony holds some patents that Canon can't circumvent.
But raise the possibility that Canon has a problem in this area and you're a troll. Any questioning of Canon's perfection is construed as a personal attack. I'm thinking what's needed is a banner--24 pt bold--across the top of every page in this forum:
A reminder: the latest scientific evidence confirms that there is absolutely no correlation--repeat, absolutely NO correlation--between your choice of camera equipment and the length of your phallus.
