DP-100 vs Nauticam 140mm

Tried to find some answers in previous posts, but for those that have gone before, will the Nauticam 140mm dome give a substantial uplift in IQ over a Zen DP-100? I'm using a Canon 8-15 with Sony 7AC in a Nauticam housing and have used the Zen for some decent fisheye images, but as usual, edges go soft. Both are glass domes and I'm wondering how much improvement to expect if I move to the 140mm dome. I do like the smaller sizes for travel purposes, so I didn't have much interest in going to a bigger dome.