Techies have already picked apart the "exciting" X8 system which is loosely based on S4 Snapdragon with Adreno 320 GPU, which isn't weak but it isn't cutting edge. The practically free Droid DNA boasts better specs besides battery, & microsd/nand. That would be significant advantage if they were all released at the same time but the DNA is already 9 months old.
I'm sure they are built well and will sell well. But they are announced with already old, but good, hardware. This may not present enough of a jump for users to upgrade from S3, DNA, Note 2, etc.