To my eyes there 90 lumens bulb is not as bright as SF 60 lumens bulb. Now that I looked again it’s not a huge difference but you will be able to see it. Being able to run on a 16650 is a huge plus though.
Those ol surefire bulbs are still pretty hard to beat if you’re fine with primaries. MN03 looks to be 15-20 lumens more than the LF 90 bulb. Pretty noticeable difference outside. I think I read somewhere around here that an mn03 is 80 something out the front lumens with fresh batteries. The LF 90 bulb is nice to have though, I like it.