[Elecraft] Why is K2 so easy to send cw with?

[Tim Logan]

Hello fellow Elecraft addicts -
I've been using my Icom 706 a lot lately while I build the amp for my 
K2.  As an 18- 20wpm cw novice I seem to have FAR more difficulty 
SENDING cw on the 706 then I do on the K2. I could swear it's not my 
imagination. After 30min on the 706 - a switch over to sending on the K2 
makes it feel like I just "jumped into a Formula I from an old truck." 
Are there factors that make one radio far easier to send cw with than 
another or is it just my imagination? If so - what are the factors that 
affect how sending cw "feels"? Thanks folks.
73/Tim NZ7C (non engineer electrical nimno)