Why isn't the 35d quicker?

[Best4x4xFAR]

Why isn't the 35d quicker?

Okay, let me start by saying I love our 35d, but has anyone ever thought about this, or just me? Its acceleration is adequate, but with 425 ft-lbs of torque, I'd honestly expect better. The 35i is roughly a second quicker to 60, despite its 125 ft-lbs deficit..

How about this comparison for you. 2017 Ford Expedition. 3.5 Liter Ecoboost. It weights roughly 1000 lbs more, has essentially the same torque rating, but its a few tenths QUICKER to 60, despite carrying an extra 1000 lbs, and having essentially the same max torque output. How quick would it be if you dropped a 1,000 pounds out of it?

Both have 6 spd autos..

Obvious difference is the Gas vs Diesel, but Torque generally equates to acceleration, so what's going on? Is it all about the gearing?

Surprisingly 1st and second gears in the 35d and the Expedition are the same rations..

The Expedition does have a slightly lower axle ratio (3.73 vs 3.64), which equates to a 2% lower gearing through 2nd gear..

Just doesn't make sense to me.. What am I missing (besides a tune)?
2013 X5d (6 speed auto)

Torque: 425 (@ 1,750 rpm)
Weight: 5,192
0-60: 6.8
1/4 mile: 15.0

Final Drive: 3.64
1st Gear: 4.170
2nd Gear: 2.34

2016 Expedition EL (6 spd auto)

Torque:420 (@2,500 rpm)
Weight: 6091 lbs
0-60: 6.5
1/4 mile: 15.1

Final Drive: 3.73
1st Gear: 4.170
2nd Gear: 2.34