EJ89 comes with five default razor blades. As mentioned in other reviews it makes sense to try out different razor blades. Razor blades have a different level of sharpness, rigidity, etc. affecting your shaving outcome.
The narrow blade gap of the Edwin Jagger double edge safety razor 89 is almost identical to Merkur 34c DE razor giving you a mild, smooth shave. If you are not familiar with the anatomy of the safety razor, why one razor is considered aggressive and another one not or you just want to learn more about wet shaving with safety razors then read also this.
Razor aggressiveness has many reasons. Blade gap being only one of them. There are some who argue that blade exposure, the angle of the blade and guard span play an even more significant role in the razors aggressiveness profile. Be that as it may, EJ89 delivers nice smooth shave with minimal effort. But if you have very sensitive skin, you might lean more towards Merkur 34c as EJ89 is known to be a tad more aggressive.