I had King's Quest 5 on my Amiga 600, but it kept crashing with a stack overflow if I remember correctly. Anyway the one thing I hated was the desert. I still cannot belive I mapped every screen of the dersert out.
I gave up and used a walkthough in the end
when I got the PC CD-ROM version with speech.
I was a bit disappointed when I got KQ8 as it was all in 3D and was more action fighting.