I saw your post and guess I need to reply since I have both of the Scott A4 rods that you mentioned. My order was reversed however with acquiring the 8wt first and then the 4 wt. It is my opinion that the action is very similar. I get the same feeling when I cast either one of the rods so it was an easy transition. The one thing that I really like about both of these rods is how you feel the rod load on the backcast.
Take it for what it's worth from just a weekend angler.