I like both the E4 and D4 a lot, but if I could only carry one, it would be the D4/SE. IMO, the E4's blade is ground a bit too thick on the primary grind. Although the D4 is also somewhat thickly ground, the SE version for me still makes the edge bevel itself quite thin. Also, both the E4/D4's handles fit my hand just right. In fact, the D4's handle is larger and more ergonomic for me than the D3's, and is about perfect.
For myself, with the primary grind having been shortened on the 4's due most likely to the larger opening hole, I wouldn't mind the primary grind going back to hollow. For example, the Police model has a rather short grind, but because it's hollow, it still allows for a relatively thin edge. If the E4/D4 did that, I doubt it would negatively affect the blade strength of these models.
Nonetheless, both are great knives.
Jim
For myself, with the primary grind having been shortened on the 4's due most likely to the larger opening hole, I wouldn't mind the primary grind going back to hollow. For example, the Police model has a rather short grind, but because it's hollow, it still allows for a relatively thin edge. If the E4/D4 did that, I doubt it would negatively affect the blade strength of these models.
Nonetheless, both are great knives.
Jim