I have a bend to my knees picking up the bar or d'bells up to my knee level, then legs are relatively straight. I don't force the knee back though, just what feels naturally straight.
Also, FWIW, I've started focusing more on a slower negative portion of the movement and creep it back down to knee level, that's the bottom of the movement for me until the bar or bells are put back on the floor
There are 3 loves in my life: my wife, my English mastiffs, and my weightlifting....Man, my wife gets really pissed when I get the 3 confused...
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