I do not have a popularity measure. But there is the ParaMonte Monte Carlo sampling library that heavily relies on Fortran 2008 and Fortran 2018. All of the major algorithms are implemented for both Coarray and MPI. A scaling comparison of the Coarray and MPI implementations is given in Figure 8 of this manuscript. However, keep in mind that this comparison is based on the two-sided communications that are implemented in the library. A more fair comparison between the two would have to contain RMA communications instead of two-sided because that is where Coarray (supposedly) truly shines.
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