What degree of ankle flexibility is normal?

I'm curious about how normal my apparent lack of flexibility there is. Particularly on the dorsiflexion side (where top of foot goes toward shin)

Am trying to become a better runner and improve half-marathon time, and I'm currently sidelined doing PT for achilles problems that should resolve in a month or so. Doing PT I'm realizing that apparently my ankle flexibility is terrible, and I had been thinking I was actually pretty flexible.

At no point in my life have I been able to do the move in the pic below, without my heel lifting off the ground.

For those who would know, is that pretty bad, in terms how flexible the typical "real" runner is?