Eight Four Suited vs Pocket Jacks

At the flop:
Winning 5% of the time
Tied 0% of the time
Losing 95% of the time

At the Turn:
Winning 11.08% of the time
Tied 0% of the time
Losing 88.92% of the time

At the River:
Winning 18.39% of the time(14.52% with trips or better)
Tied 0.47% of the time
Losing 81.14% of the time(4.6% with trips or better)