Having hunted with several friends who own/owed KOM, they all commented on how much tighter and heavier the SID was compared to their own wool. Overall the several peices of SID I still own (sold some because I'm shrinking!) I really enjoy owning it for comfort, warmth and the features of the clothing.
I like the quality of my Sleeping Indian and having owned Hidden Wolf in th e past I would say they all compare pretty favorably.
At one point some time ago Hidden/Grey wolf held a significant price advantage over SID and KOM but I think overall they price competitivly now.
So you have to decide on pattern and overall features. I'm staying with SID for now, great stuff and thier customer service was superior when I needed it.
JMHO,
Greg