What you see is the result of Honda’s brilliant (sarcasm) cylinder deactivation system (VCM) that allegedly saves 1mpg.
You should disable your VCM ASAP if you haven’t already. Tons of threads here on the topic. I’d recommend the s-vcm or vcm tuner 2... both of which are about $100 bux and may save you from an engine rebuild and damage to your catalytic converters.
Honestly yours are not too bad, so new plugs and disabling that junk should keep you running great for a long time.
It's good that you have no oil in your spark plug tubes. But those black insulators and electrodes are signs of excess oil in those cylinders. This is what VCM causes. I spent $95 times 3 vehicles for S-VCM . Whished I had known sooner.
The plugs on the right look like they have a much smaller gap than the one on the left?? I just installed a S-VCM in our 2009 and changed the plugs (about 65k on them); thankfully all 6 of mine looked similar and better than those above.