I have both in the garage. They are different bikes. The 800 is lighter, more playful, you have to work it much more. The 1100 has torque for days, heavier, you sit on it, it just feels a bit bigger. My wife has the 800 Icon, I have the 1100 Sport. The 1100 is not the same bike, more power, it is a different feeling bike.
I have only test ridden the 800.
Light super easy to ride.
Felt a little too small after my Diavel.
I bought the 1100.
Still feels light compared to the Diavel and the Wide Glide that it shares garage space with.
It is torquey, has enough room for myself and my wife to ride all afternoon.
We love it.