"unparalleled levels" is correct and usable in written English.
It is often used to describe something that is extraordinary, unique, and superior in comparison to other things. For example, "The actor's performance reached unparalleled levels of excellence."
Although Syriza's popularity has dropped precipitously, it still enjoys unparalleled levels of support.
They offer unparalleled levels of comfort and a great, supportive fit.
With distrust between the US and USSR at unparalleled levels, both sides were operating on a hair trigger.
"During the first three quarters of 2000 the city saw unparalleled levels of both rate and occupancy, a very difficult trend to maintain for a sustained period".
It will be a year when everybody will have to work incredibly hard and incredibly smartly, to get it all up and running, with unparalleled levels of co-operation between clinicians, administrators and ancillary services.
It's got some way to go - in this video, Atlas is still powered by a tether, meaning it's not fully 'wireless' - but once some sort of power source is integrated inside the robot, it will have unparalleled levels of motion.
Today, we enjoy an unparalleled level of access to and knowledge about those in the public eye.
Cellphones and the Internet, which offer teenagers an unparalleled level of privacy, make hooking up that much easier, whether they live in New York City or Boise.
However, because that agency views every transportation death as a preventable occurrence, our roads, rails and skies enjoy an unparalleled level of safety.
She took up marathon racing in 2009 and, in a whirlwind seven months, has come to dominate the sport at an unparalleled level.
Beginning in the 1940s, American photographer Eliot Porter produced subtle studies of birds and nature in which colour allowed him to render an unparalleled level of nuance.
