By comparison
Definition 1 of 1
Pro Tip 1/3Context Matters
Understand the context to use 'by comparison' correctly, it highlights differences between items or situations. 
She's quite short, but by comparison, her sister is even shorter.
Pro Tip 2/3Imply Change
'By comparison' can imply a change in perspective after an assessment or new information. 
I thought it was a good deal, but by comparison to other offers, it's not.
Pro Tip 3/3Not Always Negative
The comparison doesn't always suggest something is worse; it can also show better qualities. 
His recent speech was uplifting, by comparison to his earlier ones.