Often varying performance numbers are relative to a certain rider's skill and determination, but, the bike specs are hard to dismiss.
has 110 hp & 85 lb/ft and a dry weight of 505 lbs.
That's equal to .22 hp per lb.
BMW states the RT with go from 0-60 in 3.6 seconds.
has 116 hp & 86 lb/ft and a dry weight of 761 lbs.
That's equal to .15 hp per lb.
IIRC an LT will go 0-60 in about 4.2 to 4.6 seconds.
The hp, torque and weight makes a huge difference.
Motorcycle Online shows the RT just a bit slower than a K1200GT ('07)
They both run the quarter in the mid 11's (about a half second apart) ...no LT can match that.
Your buddy is just wishing...