I tend to trust Blackmagic with faithful image representation more than Sound Devices, but I've never used a Sound Devices product that wasn't a sound mixer. They build their mixers like tanks though, so it's hard to say. All else being equal, these record 4K, whereas the Blackmagic Video Assist of course records only 1080p.

If I were buying a monitor / recorder today, I'd probably still buy an Atomos Shogun, at student pricing of $1500. I love the Atomos interface and ease of use, plus the lemo break-out cables are a huge asset.

Wow at that price it is pretty tempting!

Sound Devices makes excellent hardware. I bet these won't be even remotely 'cheap' but they'll be worth it. At 5" I'd buy one, although I'm still hoping for a screen-less recording device like a 4K Ninja Star as I already have good-enough field monitoring and EVF devices. I'm less interested in audio as I rarely record on-board except for sync and don't want an extra cable or wireless gizmo hanging off my gimbal, but it would be nice for the shoulder-rig to handle a G3 setup or something similar for a lav + boom/shotgun/handset.

The Shogun has XLR audio inputs via a dongle. It appears the PIX requires a separate device to deliver XLR inputs that adds both cost and weight to the package. If Atomos launches a more compact 5" display version with the same features as the current Shogun, I'd probably go that route (especially if it clocks in a little cheaper).

Very optimistic/hopeful the PIX-E5H will beat the Atomos Shogun in all areas: smaller / better build quality / cheaper.

As at the moment the Shogun is the best option for the A7s, but I still don't think it is a particularly good one. There is surely better yet to come to match to the A7s!