Nobody in my group cleared A4s. My static group has only been in A8s for about 2 weeks. I can't really comment on the difficulty just yet, but going on our experiences from A5-7 I felt the difficulty was pretty spot-on for a group like ours. I feel like A7s was a little easier than A6s (Pre-nerf) but definitely not for healers of that fight.

The only thing that has me worried about A8s is the later phase with the 8 debuffs, if one condition isn't met then it's instant wipe. I feel like that could a really frustrating static killer of a fight.