@mullerh
Interesting that you have that 'contrary' result with cards in the 60csx. It is true what you heard, the class of the card is in fact indicative of it's minimum write speed. The read speed should be the same, but only when new and nonfragmented. I guess where you put the speed of the 32GiB Ultra as (1) you mean UHS-1, which is sort of equivalent to Class 10 i think. Interesting that your 8GiB card is only Class 2, i wasn't aware 8GiB cards were made with such low write speed.

Did you also find those same differences using the various cards in your 885?

Is it possible that the apparent difference in read speeds is due to the relative age and therefore use levels of your cards? Flash memory has a long but not infinite life. The more 'use', i.e. writing, formatting, and also the more fragmented the data on it becomes, then the slower it will get in both read and write.