forget the Q500 - it is not at all like the 600 and 700. The 600 and 700 are fast and light. The 700 in particular is one of the most efficient (fast) kayaks you can buy. Now there are lots of really great kayaks out there and QCC is only one brand so I’m not suggesting it is the best (there isn’t one ‘best’) - just responding to your query about QCC.
The 500 is kind of an SUV. If you were kayaking down the inside passage it’s probably a good choice to carry everything you need but if you want a really good seakayak from which you will develop skills and one which you will probably never think was a bad decision - trust me, buy the 700.
Kevlar v Carbon - tons of messages here about that. Short and simple - kevlar has some flex - carbon is pretty stiff. Stiff is good. But, flex has give, carbon has about no ‘give’ - it’s a trade-off. I got a kevlar/carbon layup - basically a bit cheaper than carbon yet lighter still than kevlar.
The layup you want … trust me you’ll get 150 opinions on that here. You are trading money for less weight and only you can put a value on that.
As to ‘dings’ keep in mind that the boat is covered with gelcoat - that’s the pretty color you see. It is hard but it will crack, chip and scratch if you bang it or drag it. Some of this is a fact of life - you are using the boat and it will show some wear. Now as to the durability of a layup of glass, carbon, or kevlar my opinion is that you probably aren’t really concerned about that because if you’ve had an ‘event’ that compromised the integrity of the boat - the kevlar, carbon, etc. - well unless you are into repairing this stuff yourself you’ll probably leave it to a pro. If you aren’t into exploring rocks and caves off the coast this is probably something you won’t ever worry about. Until it falls off the roof of your vehicle.
So to your question: ‘resists dings’ - no, none of them do that. Some will hold together better if you crash into rocks but if we are debating carbon v kevlar if you crash into rocks - - well we are talking about doing some pretty serious damage.