The phrase "at essentially the same level" is correct and usable in written English.
It can be used to describe a situation where two or more things are comparable in terms of quality, status, or importance.
Example: "The two candidates have experience and skills that place them at essentially the same level in the hiring process."
Alternatives: "at roughly the same level" or "at approximately the same level".
What Bill James and his acolytes insisted was, simply, that the future would be like the past — that ball players would perform in the majors at essentially the same level that they did in the minors.
PARIS -- International fisheries negotiators agreed Saturday to maintain the 2011 catch of endangered Mediterranean and eastern Atlantic bluefin tuna at essentially the same level as in 2010, eliciting a stinging rebuke from conservationists, who had been calling for a fishing moratorium.
"While there could be many ways to question this calculation," he said, "that the market would be at essentially the same level as it was in 1966 — when there were no PCs, no Internet, no flexible manufacturing, no software industry, and when our work force was half and our net capital stock was a third of what it is today — may be regarded by some as the sale of the century".
As a template control, the expression of a fragment of the 28S rDNA was observed in all samples at essentially the same level.
Hence, ventriculo-vascular coupling (defined as the quotient of Emax over PA-Ea) was preserved at essentially the same level as in healthy animals (Table 3).
In fact, AR was expressed at essentially the same level in both control and CAsE-PE cells (Benbrahim-Tallaa et al. 2005b).
Moreover it is shown that, in this case, there exists a number of deformation patterns, all at essentially the same stress level.
As expected, nasopharyngeal colonization by wild type transparent and opaque bacteria was essentially the same level at 24 h and at day 4.
We investigated VAChT expression at the mRNA and protein levels and found that VAChTFlox/Flox mice have essentially the same level of expression for this transporter as VAChTwt/wt mice in the striatum, cortex, spinal cord and hippocampus (Fig. 10).
