if two things or people are worlds apart, they are completely different from each other.

You can't compare a cheap stereo with a top of the range model - they're worlds apart.

• in the pink
• in the pink of
• in the pink of something
• in the pipeline
• in the process of
• in the process of doing something
• in the public eye
• in the raw
• in the red
• in the right place at the right time
• in the rough
• in the running
• in the saddle
• in the same ballpark
• in the same boat
• in the same breath
• in the same league
• in the same league as
• in the same league as someone
• in the same league as something
• in the scheme of things
• in the shadow of
• in the shadow of someone
• in the shadow of something
• in the short run