True if the Martin Baker wasn't better then the planes you mentioned. However, it was almost perfect...
"The MB5, a low-wing monoplane, fitted with a 2,340hp. Rolls-Royce Griffon 83 engine driving a pair of three-bladed counter-rotating propellers, was an aircraft of sleek and pleasing lines. Underslung radiators were placed beneath the belly of the fuselage, aft of the cockpit. This arrangement, as well as reducing the cooling drag, led to a slim and clean nose which, with the long spinner enclosing the propeller hubs, gave an exceptionally good view over the nose and leading edge of the wings. Fighter pilots flying this aircraft for the first time were full of praise of this essential tactical feature.
The fuselage primary structure of MB5 was of the now familiar steel tube construction, covered and faired with light, detachable metal panels, which offered exceptional accessibility to the equipment installations and for servicing. The engine-mounting consisted of two molybdenum-steel tapered cantilever booms, and here too the layout provided easy access to engine components and accessories. The engine was neatly cowled with panels which could be removed easily to lay bare the engine in a few minutes.
The wing was of the single-spar type, with the spar and leading edge forming a torsion-box of remarkable stiffness and strength; primary wing structure details were simple to produce and easy to repair. Flying controls were operated by torsion bars, which gave excellent positive control coupled with light operation. A sturdy wide-track undercarriage gave exceptionally good taxiing qualities, whilst its pneumatic operation was simple, effective and entirely trouble free.
It was, however, in the pilot's cockpit that one of MB5's main attractions lay. The cockpit was exceptionally well laid out, with all controls coming easily and readily to hand, within the pilots reach. Instruments were grouped in an orderly fashion, allowing routine cockpit checks to be done in logical sequence. Fuel control was centred in one lever - a feature dear to the hearts of fighter pilots. Accessibility for servicing was provided by mounting the instruments on hinged panels, which opened into the cockpit. A special primary control-unit was neatly installed in a manner economical in space, yet effective in operation, and having the advantage of bringing vital control components within the easy scrutiny of routine inspection. The cockpit was cleanly floored, an unusual feature then in British military aircraft, which gave a pleasing impression of spaciousness combined with businesslike utility.
Official reports of the day stated that the cockpit could advantageously be copied as standard for fighter aircraft. A one-piece transparent tear-drop canopy of neat design was fitted, provided with wheel control for operation by the pilot. The mechanism was perfectly balanced and easy to operate, whilst jettisoning was clean, safe and effective.
The four-cannon installation, utilising Martin-Baker flat belt-feed mechanisms, was exceptionally well arranged. The functional efficiency and destructive power of this weapon was noteworthy among contemporary aircraft, whilst the excellent accessibility of the installation permitted easy servicing and ensured a quick turnaround under operational conditions.
Not all its virtues rested in the excellence of its engineering, for in the air MB5 was unquestionably ahead of contemporary piston-engined fighters, with a top speed of 460 m.p.h. Early flight trials, in the capable hands of Bryan Greensted, quickly established it as an exceptionally good aircraft, and some older readers will remember the polished demonstration of MB5 by Squadron-leader Zurakowski as an outstanding event at the Farnborough Air Display of 1946.
Pilots liked the ease of taxiing provided by a wide-track undercarriage, the excellent all-round view, the absence of swing on take-off and landing, the spectacular rocket-like climb, the surge of power, quickly responding to throttle openings, with a corresponding bite into the air urging the aircraft forward, and the feeling of confidence given by a robust structure. They also liked sitting in a clean cockpit from which the aircraft could be flown effectively with precision and safety.
Why this aircraft was not put into production remains one of the aircraft industry's minor mysteries, and one which is often the subject of interesting speculation. Some will say that, as a piston-engined aircraft, it came too late to be acceptable in the advent of jet fighters. However, had a decision about its future been taken early by the authorities, it could have gone into production soon enough for it to have reached squadrons in sufficient numbers to have been engaged effectively in World War II. Disappointment in failing to put MB5 into production was felt keenly by all at Martin-Baker and shared by many Royal Air Force officers and other officials."
...as you can see.