Naked roof? They also had the 10 speaker set up
no shark fin etc. All in rear window.
No, if you had a satnav you got sharkfin (like mine) but if you had a normal radio then it was a "clean" roof with no whip antenna.
Other changes are as people have mentioned, 10 speakers instead of 8, blue tinted glass, rubber finishers to the rear windows on three-doors, alu ashtray cover, slightly higher quality steering wheel leather, real aluminium strips in the interior, etc...
AXX engine also has a higher quality cam follower than the later blocks. JKM had a look at mine after 90k miles and said it was as good as new.