Black hole mass as a function of dynamical mass of J1015+0020, compared with a sample of high-z, luminous, and hyper-luminous QSOs from literature. Specifically, the magenta star refers to our target, while diamonds refer to z ∼ 4.8–7.1 QSOs observed in [CII] with ALMA (see details in text). M_dyn are computed according to Eq. (3), while M_BH are single epoch estimates. The best fit M_BH–M_dyn relation from Jiang et al. (2011) is also indicated by the dashed line with the relative 0.42 dex intrinsic scatter (shaded region).