There are several level versions of the G10 irons. For comparison purposes examine level 35 and 59 iron sets.
The set at level 35 (med-high) has a club range of 105-200.
The set at level 59 (high) has a club range of 115-210;
Both these sets have the same characteristics when it comes to spin. Both have 3 dots of spin. The major difference is level 35 set has a lower trajectory. Hence, the ball will not stop as quickly compared to the same club at a higher trajectory. The easy way to compare this is use the Tour GI-SD ball. Compare the 8i and 7i on each set, and then you will see why.
Thus, the higher the club level, the greater the performance, using the same ball.