Originally Posted by
Antique Driver
The one that still does the jobs the J can't.
Which jobs?
'Can't' implies unable. What precisely can the K do, that the J can't? The SF role would suit the J nicely (better nav kit, much better performance), it just requires the will, a decision, & fitting the Gucci kit.
If there is something the K can do, & the J can't even if we want it to, then I'm genuinely interested to know what.