In this second video the Canon 24-105mm f/4 L lens was used on all three camera’s but the focal length was approximately adjusted to match. The depth of field examples are also what I expected to see from the Speed Booster specs, but the important result is the GH4 (4K) at 44mm f/2.5 compared to the F5 at 40mm f/4. (The F5 sensor is slightly smaller than S35 with a crop factor of 1.6). Because the Speed Booster gives you that extra 1 1/3 stops available from the lens, it’s certainly possible to get a very close match in depth of field between these camera’s.
From the Metabones Speedbooster review here: