Don't have the SanDisks, but have had no problems with the Lexar 1000x. I have 2 of the 16GB in my 1DX and I shoot primarily surfing which is fast action with a good amount of long bursts.
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Why would you have enough money for the 1DX n 24-70II but not 70-200II??
if money is an issue with getting 70-200IIIS, I would have get 5d3+24-70II+70-200II.