All has flawless sensor with no prediction, and all of them has good tracking rates.
So I would say that technology used in those mices are pretty same. EC eVo and G400 uses both same ADNS-3090 sensor, and generally DA uses same sensor, only difference is that in DA there is infrared light (which you can't see) instead normal glowing red light what we have in EC eVo and G400.
When you have good technology like all those mice has, you must only figure out that what shape you prefer. G400 has pretty weird shape (I mean the right side) and many don't like it. It's still one of the greatest mouse and if you just get used to shape it will be amazing mouse with amazing-low price. (35€ in Finland)
My personal opinion is that ZOWIE EC1 eVo and DeathAdder wins G400 in terms of shape, since I like IME 3.0 shape. Both of those are very similiar to IME 3.0, but I think ZOWIE EC1 eVo is even little bit more. So if you ask best ergonomic mouse my answer is ZOWIE EC1 eVo.
Whatever mice you choose from that pool you won't regret.
I had DA v1 4 years ago and I played on it for 2 years. It was THE BEST mouse ever for me at that time. It worked absolutely perfectly for those 2 years but eventually it broke and I bought DA v2 (to make 1800dpi default) and everything was fine but 1 year after I bought it, it started double clicking(left click was completely fucked, I couldn't drag icon on desktop from one place to another without it dropping 10 times) and scroll was bugged so it made me jump once every 10 minutes. On one LAN event they had g400 on every PC and since my DA is so fucked up I decided to play on g400. I played one of the best tournaments in terms of headshoting people so as soon as I got home I bought g400. Less then 3 months passed and it started double clicking on every 5-6th click but only in CS, didn't notice in other games/desktop.