Haven't heard KOIT in a while, but the delivery seems to me to be almost a beautiful Music style of delivery. Reminds me of KOST in the early 90's. As for Star and MyFm deejays sounding the same, that's because both stations share the same PD and 2 of the jocks from LA, track for SF. Kari Steele and Lisa Foxx both pull double duty. Oh yeah, almost forgot to remind you, these are Clear Channel stations, so sounding the same is the norm.
KOIT's delivery sounds to me like a brightly delivered easy listening station. They don't talk over the music or over music beds or jingle ramps. You won't hear contests or cheesy jock jingles.
KOST on the other hand you will hear music beds, listeners on air and jocks talking over jingle ramps that sing out the jock name. The talent sounds warm for the most part. Some of the formatics include weather forecasts full of old radio cliches like "Right now...Newport Beach 'checks in' with 75 degrees

....it's 80 degrees along the................................................. "Coast!" Their old top of the hour used to have a silly tag line provided by Dick Clark that said something like "Southern California's Soft Rock". I think they pulled it from their TV ad. KOST really sounds like "LA" and it took me a couple of years to get used to the station and (the area) aflter living in the Bay Area for a good chunk of my life. They are QUITE SUCCESSFUL and their airstaff has been stable force for years. They recently changed their jungle package.
KOIT's delivery is warm, friendly and simple with lots and lots of liners. They sound community driven although that may have changed "post Bonneville".