Now you mention it, when I bought these fatboys (with their very weak side wall!) I thought they looked a bit skinny compared to the fatboys (the wideboy?) I used to run on back in 2000....
BUt these ones are featureless and as smooth as my shiny pate!
Haven't come across the Kojak... that's got me interested - I've actually put a more robust slick on the back wheel after 3 blowouts in 2 months of cycling in urbania... so far all good - but it feels slightly more draggy (only 80psi) than the fatboy (which I pump to 105psi)