That looks like a Dutch.
OC, a "tall leggy Mal" is not a good one. Mals are actually pretty small dogs, 50-60lbs is pretty normal, while some of the males can get bigger, most of the working ones are bred smaller for quickness and agility. Same with the working line GSDs, it's not unusual to find males at the smaller end of the standard. One K9 cop I know has a female GSD as his partner, and she's not much more than 50lbs. On the other hand, my friend who is a director of K9 for his dept, likes bigger ones like Gunnar, who is right at 90lbs- he says that a Mal or smaller GSD will go in a car window and bite someone, but a bigger one will actually pull the guy out. Last night I was playing tug with Gunnar. I was sitting in my recliner- a big chair- and he was off to the side. He pulled me so hard that my chair started to tip over. That's 250lbs of me plus probably 100lbs of chair, moved with relative ease.
I think how hard they hit has 2 factors- speed and mass. A bigger dog might not be as fast but his mass is going to put you down. I haven't seen a smaller dog knock anyone down, but they can hit with gusto. I guess a 3rd factor would be breed, because some dogs hit differently- Rotties that I've seen, don't come in high, and when they bite, they drop and use their weight and size to pull you down.