There’s no comparison
Definition 1 of 1
Pro Tip 1/3Extent of Difference
Emphasizes a vast difference in quality or value, suggesting one is clearly superior. 
After tasting both wines, there's no comparison; this one is far better.
Pro Tip 2/3Not Literally
It's a figurative expression and doesn't require an actual comparison to be made. 
Between a handmade and a store-bought cake, there's no comparison in taste.
Pro Tip 3/3Emotional Impact
Can express personal preference or emotional bias towards the superior item. 
For me, there's no comparison between my mom's cooking and any restaurant.