Actually, I didn't. I was only there for one day and it went much faster than I would have thought for. I was trying to test headphones in a higher price bracket. Though I should have tried those.
I have a few Hifiman headphones and they kind have turned me off with their attitude to be frank. Their responses to people in these forums and just in general. Not to mention their silent revisions on headphones. I like them because they have a very full line up with headphones at all price points. They are not unlike Sennheiser or Sony or Audio Technica in this sense. This is very nice compared to the very V shape pricing structure some brands have. I've never had build quality issues with any of the Hifiman I've owned either (I know that's a common complaint), but I just kinda skipped them at CanJam for whatever reason.
Next time around I'll try them. I'm not overly impressed with any of the bass from Hifiman though. The planar speed is great, they can have detailed bass, but it's just light. The Hifiman I've tried or own don't scratch my bass head itch for impact. They just don't move air that well.
The R7DX with JM's modification comes very close to hitting that spot for me. Those are good. I listened to them nonstop for weeks. They aren't planar though. If the closed back Sundara can deliver close to that, then it's probably a good pair in my book. To be clear - for my preference/taste. I did have the modded R7DX with me and I did plan on comparing to other Hifiman, but I just never got there unfortunately.
lol I was also somewhat worried about getting dirty looks or something from them if I walked up to their booth with those headphones. Or having to get into an awkward conversation about how they should just hire JM to do their tuning.