When my mother bought the GBA port for me I played until my characters reached the final boss, but, for some reason, I stopped playing.
I played the DS remake with Jeremy, but I didn't actually finish the game; he did. I didn't even watch the ending of FFIV, because I was asleep, and I wouldn't get up.
A few months ago I found a great deal on Ebay, though: FFIV, FFIV Easytype, FFV, and FFVI Super Famicon cartridges were for sale (together) for about forty dollars, and I bought them. Maybe I'll play one of them next month.