Hey buddy, I actually have both pairs. I bought the Okwahn's first as I had a $50 GC and the local outlet had my color for $63.99. Couldn't pass them up for that as I plan on using them when it gets nice out when I ride my new Trek I bought. These I went tts (11) and they fit great (just a little room at the end, the way I like my shoes to be).
Then I found a seller on eBay who had the color of Revaderchis I had been wanting. Made an offer and be took it. Those I went .5 down (10.5) as they are cut long. I have a normal to slightly narrow foot and when I tried my tts, they felt off. So I tired a half size down and the fit was perfect. Gonna wear these as well when I break out the new bike. 17 years ago, when I was riding a lot, I wore Mowabbs (ironically the OG of the colorway Olivia Kim came out with). Just couldn't bite on $180 for them this time. Grab both shoes, you'll like them.