150-600mm vs 150-400mm +1.25 extender How do they compare to each other ?

In this, the third video of my series on OM System`s 150-600mm F5/6.3 lens, I test it out in comparison to my own 150-400mm + 1.25 extender. The difference in price between the two lenses is huge, but is the 150-400mm worth the extra money ?

Track 1 :
Title - Tenderness
Artist : Benjamin Tissot
Music by: Bensound.com/free-music-for-videos
License code: TY9UQYJJUB3LZMPQ
Track 2 :
Title : Summer
Artist : Benjamin Tissot
Music by https://www.bensound.com
License code: ENBFM4O707NNVDI4
Track 3 :
Title : Dreams
Artist : Benjamin Tissot
Music: Bensound.com/royalty-free-music
License code: LJX2TBBZQINDPL40

Links to my previous videos on the 150-600mm :
Part 1 :    • Testing out OM System`s new 150 - 600...  
Part 2 :    • Testing out OM System`s new 150 - 600...