Not really. I have not seen a 5k through the lenses yet. But The resolution vs the increased FOV by mathematical measure does not equal a significant sde improvement on the Pimax 5k. The real measure now though is the Vive pro. And the 5k will have worse SDE than vive pro for certain. Vive pro has better resolution and smaller FOV. The worry I have is nausea. If the 8k gives me nausea because of the lower refresh rate, the SDE will not matter anymore.
EDIT : I was reading he specs for the vive pro wrong. It said 2880x1600. I thought this was per eye. It is 1440x1600 per eye. The Pimax 5k is 2560x1440 per eye. Vertical res is lower but it is still much higher res… My mistake