Ah, just read somewhere else:
"
It’s done that by offering cassettes which start with a 10-tooth smallest sprocket. Coupled with SRAM’s 48 tooth large chainring, that gives you a top gear ratio just smaller than a 53×11, but with a smaller, lighter front plate. At the back, there are options up to 33 teeth which, coupled to a 35 tooth inner chainring give exactly the same low ratio as a 34×32."
So, I interpret it in the following manner: 50-11 will make me move slower than 48-10 at same cadence and 34-32 will be as easy when climbing as 35-33.