Fsmithjack --
Firstly: to my ears the JBL K2 S9900's are severely under appreciated. I believe this is mostly due to the type of speakers they are (i.e. horn mids/tweeter, and 15" bass/midrange), which I gather has many audiophiles turning away their attention just for these specs alone - without even audition them. Plus there may be the overall JBL heritage and their connection to their widespread use in studio's, cinemas and PA-installation, which may lead in some to the association of "this is not hifi," or something along those lines (that they're not hifi in the typical sense is not a bad thing, to my ears). Moreover, many seem to ridicule the S9900's (and Everest's, for that matter) for sporting rather lackluster bass roll-off specs, while ignoring the conservative nature of these specs and in-room response. In short, I'd advice you to put aside any preoccupation with specs and prejustice in general, instead keeping an open mind and use your ears.
That being said, some (myself incl.) may certainly find the S9900's better than above mentioned speakers, while others don't. I can definately attest that "they image and get you super close to the music" - closer even than above other speakers, and their abilities into imaging and general presentation is akin in some sense to panel speakers, with a "through an open window" type of imaging as opposed to using room reflections in a more outspoken fashion (as is usually the case with direct radiating speakers). The S9900's are direct, extremely clean-sounding and effortless, with macro- and micro dynamics to spare, and with a perhaps slightly warm-ish bass and lower mids (but very dynamic still).
Do they compete? Oh yes, easily so, but whether they're your cup of tea is something you'll have to find out by actually listening to them. Do it quickly - they may appeal to you immensely.