In general, Sony EXMOR has more DR until ISO400. Canon has more DR at ISO above 1600.
I certainly am not interested in any dr mud slinging, but it has to be noted that Sony's advantage at low iso is very large and noticeable while Canon's advantage at higher iso (see individual model dr curves) are minor.
I'm generally looking here, though it's mostly dxo data: http://sensorgen.info/I am finding that my 6D has fair DR at 100 and a very high DR in comparison at higher ISO's.
My standard comment: Use Magic Lantern's dual_iso, it boosts your dynamic range at iso 100 to about 14.5+ stops at (nearly) no loss of iq but usability hassle. It also will have a mini_iso module in the near future adding 1/3-1/2 ev of dynamic range just like that, it's about the same optimization Canon did to the 1dx.
The thing to consider, is that very high ISO's like I often use, there is very little DR to begin with. Even a small amount is a big improvement. When DR is only 5 stops, 1/2 stop is a noticible improvement for virtually every photo, but the average photo has no noticible improvement with a 20% DR at ISO 100, you have to have poor lighting with deep shadows or a poor exposure to see the benefit.
+1. That is the conclusion I came to as well.
I have to admit I haven't personally tested an Exmor sensor camera to see for myself exactly how much difference Exmor makes at low ISO in real world shooting (or at least my real world shooting!), so I suppose that means take my opinion with a grain of salt, but for my needs DR/latitude at higher ISOs seems more important - noting I'm pretty happy with the photos I get with my 6D at low ISO even if they may lag behind what Exmor can produce. (I really should get hold of a camera with Exmor one day and try it out for myself, I guess.)
I don't understand all the threads (I'm not talking about this one) which degenerate into heated dispute about Canon v Exmor DR. Every system has a set of trade offs so it is just a case of choosing which set of trade offs suits you personally prefer. Some photographers will value DR/latitude at low ISO very highly, in which case a system which includes a camera with Exmor is likely to be very attractive (subject to weighing up all of the other trade offs, of course). Others won't value DR/latitude at low ISO so highly, so a system which includes a camera with Exmor isn't necessarily as appealing (but again, subject to weighing up all of the trade offs). All else being equal I'm all for more DR if it is on offer, but in reality all else is not equal.