Well they are one of few older German premium 35mm brand still around, the Japanese companies knocked most the of German companies out of photography in the 60’s & 70’s, today Nikon & Canon’s premium lenses and cameras are as good as Leica
But the Leica legendary you talk about is with their M series cameras, the “M” are rangefinder and not SLR, so you do not see thru lens as you do with an SLR, most companies stopped making RF back the late 60’s but Leica keep making them, both RF & SLRs have there pluses & negatives, the big plus with any RF is that they smaller and lighter that an equivalent premium SLR systems