I made a sweater with Debbie Bliss Merino, which is a superwash. I've worn it a few times and haven't noticed any pilling. I will say, though, that it stretched quite a bit when I wet it to block it, so from now on I'll wash my swatches, for sure.
I also made a sweater with a superwash 'regular' wool and haven't noticed much pilling there, either.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog