Is it worth upgrading a CD player?

I’ve had my Marantz CD6002 for around 14 years and it’s still going strong. I have it connected to an Audiolab M-DAC+ and play via my Rega amp. I’m mostly vinyl but have started to playvmy CD’s more recently and wondered whether upgrading the CD player would be worth it or not, given the fact it’s played via a dedicated DAC. Am I right in thinking there would be little noticeable improvement?