I think it's context-dependent: I don't have insight into OSS Nokalva's use inside big companies, but in the Open Source world it certainly isn't dominant.
In Open Source, I think the biggest ASN.1 implementations I come across are OpenSSL's, libtasn1, asn1c, and then per-language implementations like pyasn1.
In Open Source, I think the biggest ASN.1 implementations I come across are OpenSSL's, libtasn1, asn1c, and then per-language implementations like pyasn1.