The first 747 (entered service January 1970) had over 970 dials, guages, knobs and switches vs 375 for the -400.
The -400 series (entered service early 1989) had a glass panel and 2 instead of 3 cockpit crew.
Also, there are at least 31 outstanding orders (as of June) for the current -8 model.
This must be from someone from Barcelona!