The phrase 'contrast greatly' is correct and usable in written English.
You can use this phrase to talk about two or more things that are completely different from each other. For example, "The city and the countryside contrast greatly—the city is bustling and exciting, while the countryside is peaceful and quiet."
Russia's investigations into terrorism, however, contrast greatly with that of other countries.
Mr. Lorre's current fortunes contrast greatly with what was a long, bitter road.
Plans developed at FGCs contrast greatly with those made at child protection conferences and other planning meetings by professionals and imposed on families.
The crimes he's accused of contrast greatly with the portrait he'd painted on social media of a God-fearing husband and grandfather.
The prairie breeding and short migrations of most Marbled Godwits contrast greatly with the long Arctic to southern South America migration of Hudsonian Godwits (Limosa haemastica).
The conciliatory words and the quick retreat from the project, however, contrast greatly with New Haven's aggressive defense of the mall project in recent months against a legal and public relations barrage from its opponents, including some state legislators and a mall developer that controls an existing mall in nearby Milford.
The coast of China contrasts greatly between South and North.
These enjoyably ridiculous low-budget pictures contrasted greatly with the films he made in the 1940s.
It contrasts greatly with the mating behavior of other status-conscious mammalian predators -- and with the behavior of male lions.
This contrasts greatly with another theme, which he described as elements of modern life.
Two piano quartets, contrasting greatly in mood, are alike in containing a balance between piano and strings.
