You know, I absolutely LOVE! the -400. Together with the 777 it's my favorite long-haul jet.
I must say however, that I got very lucky indeed a few years ago to fly from Tokyo Narita to Singapore on a United Airlines B747-100, complete with the 'three window' upper deck. I nearly peed in my pants from excitement when we were called for boarding and I saw that classic bird. The interior was brand new and immaculate, just like a -400. Flight was quiet and comfortable. I'm very happy that I had the chance to fly on a true classic like that.
My first 747 experience was on a KLM 747-206B-SUD (PH-BUU, 'Sir Frank Whittle') back in 1988. Also flew as a passenger in 1990 on KLM's PH-BUH from SIN-AMS. Interestingly, that aircraft has since been converted to a freighter!!