Yes, Margaret - that IS one thing I did notice about Sparky. He does have "more energy" or "more spunk" or "more SOMETHING" than my other three cats who are considerably more "laid back". He is the definate stand out in the crowd.
The other thing that Neil and I noticed is that the cats all actully have different facial features. Sparky looks very much like and Egyptian cat from way back before the birth of Christ. He has a very sharp, elegant profile - the type you would see in the cats sarcophogus's of Ancient Egypt.
Milo and Muffin have HUGE eyes and heads - their bone structures are much larger than Sparky's and Peaches are (they are brother and sister). Their profiles are not as "sharp" or as "defined" as Sparky's is. People love Milo (and Muffin) due to their fluffiness and how HUGE they are. Especially Milo since he was the biggest in the litter, he is a really big cuddly looking cat. Muffin was the runt but she's still very big - bigger than Sparky and Peaches.
Peaches - she's a very feminine, delicate little girl. You would almost think she would break if you dropped her or something. Her profile is a good one too - but not quite as defined as Sparky's. She would fit in well in Ancient Egypt too only she would be more of a "fancy, catered to cat - a lap cat for Cleopatra perhaps because of her very long, very soft flowing hair. Sparky would have been a King's cat. Regal and proud.
It's funny how they can all be so very different. With purrsonalities to match as well.