Olympus is on tour releasing multiple interviews. And they all have the same content:

1) Olympus will NEVER go Full Frame. They think they are well positioned in this niche market with most of the other players fighting each other in the Full Frame segment
2) They once more say the E-M5III is coming soon for sure
3) More High Quality lenses will be announced this year before the 150-400mm lens launch in 2020.

via Dpreview

We are eagerly waiting if the new Fuji GFX100 camera will finally be capable to clearly outperform the Full Frame competition. So far it’s hard to rationally justify the price difference. Fujirumors spotted a new Fuji interview done by Pixel Village and Fuji clearly stated that:

You will be amazed by the image quality of GFX 100 coupled with GF lenses

Here are some more info reposted from Fujirumors:

APS-C vs FF

• Thanks to APS-C as opposed to FF, the overall cost of the system is lower
• Fujifilm has no plans to go full frame
• APS-C has the potential to get more than 26 megapixel, and Fujifilm will look for “opportunities” to go higher in terms of megapixel
• Megapixel is not everything. Fujifilm should look also at dynamic range, ISO sensitivity and overall image quality
• Image quality is determinated not only by sensor size, but also by glass
• Full Frame glass is becoming bigger, heavier and more expensive. APS-C lenses are smaller, bright enough and more affordable

GFX System

• current 44×33 GFX sensor is more than enough to deliver the best image quality
• No need to make a camera with even bigger sensor. Would have little benefits in terms of IQ, and big downsides in terms of size, weight and costs
• Current GFX sensor is 70% larger than full frame
• You will be amazed by the image quality of GFX 100 coupled with GF lenses

Samyang just launched two new manual focus Z-mount lenses:

14mm f/2.8 (specs and images here)
85mm f/1.4 (specs and images here)

There should be one more E-mount lens announcement in 1-2 weeks!