There is no such speed booster.
A speed booster makes a MFT sensor look close to a cropped sensor not a full frame sensor.

Ultra multiplies by 0.71 while XL multiplies by 0.64.

Professional quality videos have to be color corrected by using a quality monitor that is properly calibrated and is interfacing with a computer using a dedicated and specialized video card.

You may opt not to do any of that but then do not expect to have a professional quality video!

You can't be serious!

I agree, the GX80/85's sensor's colors are an improvement over the GH4/G7 sensor.

I also like the video levels (including the over 100% peaks), I do not miss the data levels that were available on the GH4/G7.
However you do have to bring them into legal to prevent clipping in an NLE or when they are rendered extended to data levels!

By the way the only negative for me was the choice of having a wide aperture on the two ladies in the first interview on the couch. It is not really neccesary as there is not much of a background and it is really hard to keep them in tack sharp focus because they move front to back.

I really do not feel like arguing this, finding 1080p 4:4:4: better quality than the original 4k because throwing away 3/4 of information is not a problem because at least the color info is not thrown away does not even begin to make sense to me.

I have a 4k 4:4:4 display, and I make 4k videos and it is more than obvious that 4k 4:2:0 is far better than 1080p, 4:4:4 or not!