IWC Spitfire 3787 Poor Luminosity?

I recently bought a used spitfire 3878 and I noticed the luminosity on the watch is very poor compared to some other IWC watches I've seen on the internet. Anyone else experiencing the same problem? I bought my watch from an authorized dealer and nothing about the watch seems suspicious other than the luminosity.

Mine is quite OK, not spectacular, but not poor either. Maybe it depends on what you expect. I don't use it much anyway.

Kind regards,
Paul

I would say mine is fair, not bright at all. In a dark room it has a soft glow, you will definitely look twice to confirm

Is the watch under warranty?