Comparison between bolometric luminosities (upper), black hole masses (central), and Eddington ratios (lower panel) for the quasars in the enlarged XQR-30 sample that were previously observed and studied in the literature: black diamond (Chehade et al. 2018), yellow diamond (Shen et al. 2019), grey circle (Reed et al. 2019), pink pentagon (Yang et al. 2021), and red squares (Farina et al. 2022). The dashed black line denotes the one-to-one relation. The filled symbols represent data of sources from the core XQR-30 survey, while empty ones show data from the literature sample.