Manny's career LF UZR/150 is -20.7. Not a big difference from the overall OF number, but a difference nonetheless.
Manny cost the team approximately 2 wins defensively per season on average. Hanley cost the team approximately 3 wins defensively over one season.
Manny also had a season where his UZR/150 was -33.8, which was worse than Hanley's, and another season where it was -28.3.
How, in anyone's right mind, does that make Manny "fine" or "adequate" or "leagues above Hanley" or "a far cry from Hanley's".
Whether Manny was an outfielder or not, his defense was terrible, not much better than Hanley's. The only reason his defense was tolerated was because of his offense.