Hi Mike,
Sorry I've never heard J-Es before so I can't comment on the sound, only the temperature

. 6c33c-bs run HOT HOT HOT! I've lived with BAT VK-150s (total of 8 6c33c tubes) and Lamm ML 1.1s (total of only 4). All I can say is I hope you've got some seriously good AC or live in a very cold state because those 24 tubes will be hot enough to toast bread. Actually the 4 tubes a side were already hot enough to toast bread. The 12 a side might be able to slow roast a couple of chickens.
I can comment on Lamm though. The VR-7 SEs they are fairly sensitive and if you check with ceedee you'll find they run fine with the Kronzilla monoblocks. Personally, I like gobs of spare power. Just nice to know it's there when you need it right? I'd go for the Lamm M2.2s take the savings and double the power of the 1.2 Refs and upgrade the 6922 with premium NOS as my choice from the Lamm stable to match with VR-7 SEs. They are after all my choice for the VR-9s even if I do have M1.2 Refs and ML1.1s on hand.
J-Es are rather rare just as VR-7SEs are rare. I do hope someone with actual experience with them both can help you out.
All the Best,
JackD201