I checked out the Lightning Lap videos for the CT4 and CT5, from the start of the lap through T16.
The CT4 carried more speed through every slow corner except Oak Tree, where the two cars tied. The slow speed corner delta was 1-to-4 mph in favor of the CT4. The CT5 was faster on the straights - a lot faster. Speed deltas in the short chutes between corners were 3-6 mph in favor of the CT5; on the longer straights the CT5 was 12-16 mph faster.
It looks like the CT5's speed in the short chutes is all by itself enough to offset the slower cornering speed. In the twisty bit of the track from the final marker for T1 through the turn in for T5, the CT5 was about 0.25 seconds faster despite being slower in every corner. And then on the straights the CT5 just piled the hurt on.
CT5 looked like it was more work to drive. At the end of the back straight while turning in for T13, the driver was literally begging the car to slow down.
WHERE | CT4 | CT5 | CT4 minus CT5 |
Vmin T1 | 46 | 45 | 1 |
Vmin T3 | 63 | 61 | 2 |
Vmin T4 | 47 | 46 | 1 |
Vmin T5a | 70 | 67 | 3 |
Vmin T10 | 90 | 87 | 3 |
Vmin Oak Tree | 44 | 44 | 0 |
Vmin T13 | 39 | 35 | 4 |
Vmin T15a-b | 52 | 48 | 4 |
Vmin T16 | 44 | 43 | 1 |
WHERE | CT4 | CT5 | CT4 minus CT5 |
Start/Finish | 134 | 146 | -12 |
Vmax T1 - T3 | 98 | 101 | -3 |
Vmax T3 - T4 | 88 | 91 | -3 |
Bridge | 118 | 131 | -13 |
Vmax Back Straight | 134 | 150 | -16 |
Vmax T13 - T15 | 106 | 112 | -6 |