Paul,
I've been playing with my ESEE-4 a bit. I own a HEST, though I do not own a 5 (nor do I plan to ATM.) The 4 IMHO is just an all around great size. Use it for your kitchen work, make fuzz sticks with it, batton it through just about anything (I did today.) The reason I don't care to own a 5 is because it's such a brick of a knife. The 4 seems to me quite indestructible (if you use it right, sure you could jackhammer it into sheet-metal) The 4 is no chopper though. That's the turf of the Junglas/ Light Machete. I hope this helps you some.
God bless,
Adam