Generally vehicles will show dents before a roof will show damage, but that's not a very strong rule of thumb. Class 4 is rated to withstand impacts from hail that is 1/4" larger than a non-class 4 shingle. With broken window you very well may have damage. One thing that Class 4 does well is to shrug off impacts on the leeward side in very directional storms, or on stepper roofs. This means you can have one or two sides totalled, with either nothing, or just a repair on the other roof slopes.
On another note, allegedly there was 5.5" hail in Bethune last night, which breaks the state record by an inch! I was actually driving into that storm last night but got held up in Kit Carson and the storm went off to the side of the highway.
The world record hail is 8" and was in South Dakota.