I believe 109K4 will out climb the 38 but all that brute power up front has a disadvantage, lots and lots of torque. The 38 has a good zoom and is one of the better climbers in the american stable in sustained climb rate but what makes it so nice is that it's is completely docile and stable once you get the top. The rope, and spiral climbs are a couple personal favorites of mine and work very well in the 38 when done right.