The Sentinel-2A MultiSpectral Instrument (MSI) data has spectral bands very similar to Landsat 8 and 9 (excluding the thermal bands of Thermal Infrared Sensor (TIRS)).
All Sentinel-2 data are freely available from the Copernicus Open Access Hub; therefore, users are encouraged to download the data via https://scihub.copernicus.eu/. To learn more about Sentinel data access information please visit: https://sentinel.esa.int/web/sentinel/sentinel-data-access. If you have questions on how to access the data from Copernicus please contact their support team at: email@example.com.
Learn more: USGS EROS Sentinel-2 Landsat Comparison